Diff of the two buildlogs:

--
--- b1/build.log	2023-04-10 14:58:28.632597226 +0000
+++ b2/build.log	2023-04-10 14:59:35.714356357 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Sun May 12 09:20:26 -12 2024
-I: pbuilder-time-stamp: 1715548826
+I: Current time: Tue Apr 11 04:58:31 +14 2023
+I: pbuilder-time-stamp: 1681138711
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/bookworm-reproducible-base.tgz]
 I: copying local configuration
@@ -16,7 +16,7 @@
 I: copying [./ruby-atlassian-jwt_0.2.1.orig.tar.bz2]
 I: copying [./ruby-atlassian-jwt_0.2.1-1.debian.tar.xz]
 I: Extracting source
-gpgv: Signature made Mon Dec  6 16:09:42 2021 -12
+gpgv: Signature made Tue Dec  7 18:09:42 2021 +14
 gpgv:                using RSA key BEED4DED5544A4C03E283DC74BCD0567C296D05D
 gpgv: Can't check signature: No public key
 dpkg-source: warning: cannot verify inline signature for ./ruby-atlassian-jwt_0.2.1-1.dsc: no acceptable signature found
@@ -25,11 +25,20 @@
 dpkg-source: info: unpacking ruby-atlassian-jwt_0.2.1-1.debian.tar.xz
 I: Not using root during the build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/20628/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/24543/tmp/hooks/D01_modify_environment starting
+debug: Running on codethink10-arm64.
+I: Changing host+domainname to test build reproducibility
+I: Adding a custom variable just for the fun of it...
+I: Changing /bin/sh to bash
+lrwxrwxrwx 1 root root 4 Jan  6 03:20 /bin/sh -> dash
+I: Setting pbuilder2's login shell to /bin/bash
+I: Setting pbuilder2's GECOS to second user,second room,second work-phone,second home-phone,second other
+I: user script /srv/workspace/pbuilder/24543/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/24543/tmp/hooks/D02_print_environment starting
 I: set
   BUILDDIR='/build'
-  BUILDUSERGECOS='first user,first room,first work-phone,first home-phone,first other'
-  BUILDUSERNAME='pbuilder1'
+  BUILDUSERGECOS='second user,second room,second work-phone,second home-phone,second other'
+  BUILDUSERNAME='pbuilder2'
   BUILD_ARCH='arm64'
   DEBIAN_FRONTEND='noninteractive'
   DEB_BUILD_OPTIONS='buildinfo=+all reproducible=+all parallel=8'
@@ -39,38 +48,38 @@
   IFS=' 	
   '
   LANG='C'
-  LANGUAGE='en_US:en'
+  LANGUAGE='nl_BE:nl'
   LC_ALL='C'
   MAIL='/var/mail/root'
   OPTIND='1'
-  PATH='/usr/sbin:/usr/bin:/sbin:/bin:/usr/games'
+  PATH='/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/i/capture/the/path'
   PBCURRENTCOMMANDLINEOPERATION='build'
   PBUILDER_OPERATION='build'
   PBUILDER_PKGDATADIR='/usr/share/pbuilder'
   PBUILDER_PKGLIBDIR='/usr/lib/pbuilder'
   PBUILDER_SYSCONFDIR='/etc'
-  PPID='20628'
+  PPID='24543'
   PS1='# '
   PS2='> '
   PS4='+ '
   PWD='/'
   SHELL='/bin/bash'
   SHLVL='2'
-  SUDO_COMMAND='/usr/bin/timeout -k 18.1h 18h /usr/bin/ionice -c 3 /usr/bin/nice /usr/sbin/pbuilder --build --configfile /srv/reproducible-results/rbuild-debian/r-b-build.qP7XkwMe/pbuilderrc_VxOZ --distribution bookworm --hookdir /etc/pbuilder/first-build-hooks --debbuildopts -b --basetgz /var/cache/pbuilder/bookworm-reproducible-base.tgz --buildresult /srv/reproducible-results/rbuild-debian/r-b-build.qP7XkwMe/b1 --logfile b1/build.log ruby-atlassian-jwt_0.2.1-1.dsc'
+  SUDO_COMMAND='/usr/bin/timeout -k 24.1h 24h /usr/bin/ionice -c 3 /usr/bin/nice -n 11 /usr/bin/unshare --uts -- /usr/sbin/pbuilder --build --configfile /srv/reproducible-results/rbuild-debian/r-b-build.qP7XkwMe/pbuilderrc_46Bj --distribution bookworm --hookdir /etc/pbuilder/rebuild-hooks --debbuildopts -b --basetgz /var/cache/pbuilder/bookworm-reproducible-base.tgz --buildresult /srv/reproducible-results/rbuild-debian/r-b-build.qP7XkwMe/b2 --logfile b2/build.log --extrapackages usrmerge ruby-atlassian-jwt_0.2.1-1.dsc'
   SUDO_GID='117'
   SUDO_UID='110'
   SUDO_USER='jenkins'
   TERM='unknown'
-  TZ='/usr/share/zoneinfo/Etc/GMT+12'
+  TZ='/usr/share/zoneinfo/Etc/GMT-14'
   USER='root'
   USERNAME='root'
   _='/usr/bin/systemd-run'
   http_proxy='http://192.168.101.16:3128'
 I: uname -a
-  Linux codethink15-arm64 4.15.0-208-generic #220-Ubuntu SMP Mon Mar 20 14:28:12 UTC 2023 aarch64 GNU/Linux
+  Linux i-capture-the-hostname 4.15.0-208-generic #220-Ubuntu SMP Mon Mar 20 14:28:12 UTC 2023 aarch64 GNU/Linux
 I: ls -l /bin
-  lrwxrwxrwx 1 root root 7 May 12 04:47 /bin -> usr/bin
-I: user script /srv/workspace/pbuilder/20628/tmp/hooks/D02_print_environment finished
+  lrwxrwxrwx 1 root root 7 Apr  9 00:25 /bin -> usr/bin
+I: user script /srv/workspace/pbuilder/24543/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -244,7 +253,7 @@
 Get: 130 http://deb.debian.org/debian bookworm/main arm64 ruby-rspec-expectations all 3.12.0c0e1m1s0-1 [89.5 kB]
 Get: 131 http://deb.debian.org/debian bookworm/main arm64 ruby-rspec-mocks all 3.12.0c0e1m1s0-1 [79.5 kB]
 Get: 132 http://deb.debian.org/debian bookworm/main arm64 ruby-rspec all 3.12.0c0e1m1s0-1 [5084 B]
-Fetched 45.6 MB in 7s (6930 kB/s)
+Fetched 45.6 MB in 4s (11.7 MB/s)
 debconf: delaying package configuration, since apt-utils is not installed
 Selecting previously unselected package libpython3.11-minimal:arm64.
 (Reading database ... 
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(Reading database ... 95%
(Reading database ... 100%
(Reading database ... 19616 files and directories currently installed.)
@@ -795,8 +804,17 @@
 Writing extended state information...
 Building tag database...
  -> Finished parsing the build-deps
+Reading package lists...
+Building dependency tree...
+Reading state information...
+usrmerge is already the newest version (35).
+0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
 I: Building the package
-I: Running cd /build/ruby-atlassian-jwt-0.2.1/ && env PATH="/usr/sbin:/usr/bin:/sbin:/bin:/usr/games" HOME="/nonexistent/first-build" dpkg-buildpackage -us -uc -b && env PATH="/usr/sbin:/usr/bin:/sbin:/bin:/usr/games" HOME="/nonexistent/first-build" dpkg-genchanges -S  > ../ruby-atlassian-jwt_0.2.1-1_source.changes
+I: user script /srv/workspace/pbuilder/24543/tmp/hooks/A99_set_merged_usr starting
+Re-configuring usrmerge...
+I: user script /srv/workspace/pbuilder/24543/tmp/hooks/A99_set_merged_usr finished
+hostname: Temporary failure in name resolution
+I: Running cd /build/ruby-atlassian-jwt-0.2.1/ && env PATH="/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/i/capture/the/path" HOME="/nonexistent/second-build" dpkg-buildpackage -us -uc -b && env PATH="/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/i/capture/the/path" HOME="/nonexistent/second-build" dpkg-genchanges -S  > ../ruby-atlassian-jwt_0.2.1-1_source.changes
 dpkg-buildpackage: info: source package ruby-atlassian-jwt
 dpkg-buildpackage: info: source version 0.2.1-1
 dpkg-buildpackage: info: source distribution unstable
@@ -825,7 +843,7 @@
    dh_prep -O--buildsystem=ruby
    dh_auto_install --destdir=debian/ruby-atlassian-jwt/ -O--buildsystem=ruby
 	dh_ruby --install /build/ruby-atlassian-jwt-0.2.1/debian/ruby-atlassian-jwt
-/usr/bin/ruby3.1 -S gem build --config-file /dev/null --verbose /tmp/d20240512-27092-h190sv/gemspec
+/usr/bin/ruby3.1 -S gem build --config-file /dev/null --verbose /tmp/d20230411-6631-uejei4/gemspec
 Failed to load /dev/null because it doesn't contain valid YAML hash
 WARNING:  license value 'Apache 2.0' is invalid.  Use a license identifier from
 http://spdx.org/licenses or 'Nonstandard' for a nonstandard license.
@@ -835,7 +853,7 @@
   Name: atlassian-jwt
   Version: 0.2.1
   File: atlassian-jwt-0.2.1.gem
-/usr/bin/ruby3.1 -S gem install --config-file /dev/null --verbose --local --verbose --no-document --ignore-dependencies --install-dir debian/ruby-atlassian-jwt/usr/share/rubygems-integration/all /tmp/d20240512-27092-h190sv/atlassian-jwt-0.2.1.gem
+/usr/bin/ruby3.1 -S gem install --config-file /dev/null --verbose --local --verbose --no-document --ignore-dependencies --install-dir debian/ruby-atlassian-jwt/usr/share/rubygems-integration/all /tmp/d20230411-6631-uejei4/atlassian-jwt-0.2.1.gem
 Failed to load /dev/null because it doesn't contain valid YAML hash
 /build/ruby-atlassian-jwt-0.2.1/debian/ruby-atlassian-jwt/usr/share/rubygems-integration/all/gems/atlassian-jwt-0.2.1/lib/atlassian/jwt.rb
 /build/ruby-atlassian-jwt-0.2.1/debian/ruby-atlassian-jwt/usr/share/rubygems-integration/all/gems/atlassian-jwt-0.2.1/lib/atlassian/jwt/version.rb
@@ -1109,7 +1127,7 @@
   BasePath RFC3986 Subdelimiters (uri) - Canonical URL
   BasePath RFC3986 Subdelimiters (uri) - QSH match
 
-Finished in 0.29933 seconds (files took 0.72319 seconds to load)
+Finished in 0.33334 seconds (files took 0.81088 seconds to load)
 237 examples, 0 failures
 
 
@@ -1145,12 +1163,14 @@
 dpkg-buildpackage: info: binary-only upload (no source included)
 dpkg-genchanges: info: including full source code in upload
 I: copying local configuration
+I: user script /srv/workspace/pbuilder/24543/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/24543/tmp/hooks/B01_cleanup finished
 I: unmounting dev/ptmx filesystem
 I: unmounting dev/pts filesystem
 I: unmounting dev/shm filesystem
 I: unmounting proc filesystem
 I: unmounting sys filesystem
 I: cleaning the build env 
-I: removing directory /srv/workspace/pbuilder/20628 and its subdirectories
-I: Current time: Sun May 12 09:21:27 -12 2024
-I: pbuilder-time-stamp: 1715548887
+I: removing directory /srv/workspace/pbuilder/24543 and its subdirectories
+I: Current time: Tue Apr 11 04:59:34 +14 2023
+I: pbuilder-time-stamp: 1681138774