[PATCH] ci: fix Python dependency on Ubuntu 24.04

Newer versions of Ubuntu have dropped Python 2 starting with Ubuntu
23.04. By default though, our CI setups will try to use that Python
version on all Ubuntu-based jobs except for the "linux-gcc" one.

We didn't notice this issue due to two reasons:

  - The "ubuntu:latest" tag always points to the latest LTS release.
    Until a few weeks ago this was Ubuntu 22.04, which still had Python
    2.

  - Our Docker-based CI jobs had their own script to install
    dependencies until 9cdeb34b96 (ci: merge scripts which install
    dependencies, 2024-04-12), where we didn't even try to install
    Python at all for many of them.

Since the CI refactorings have originally been implemented, Ubuntu
24.04 was released, and it being an LTS versions means that the "latest"
tag now points to that Python-2-less version. Consequently, those jobs
that use "ubuntu:latest" broke.

Address this by using Python 2 on Ubuntu 20.04, only, whereas we use
Python 3 on all other Ubuntu jobs. Eventually, we should think about
dropping support for Python 2 completely.

Reported-by: Justin Tobler <redacted>
Signed-off-by: Patrick Steinhardt <redacted>
---

Note: this topic depends on ps/ci-test-with-jgit at 70b81fbf3c (t0612:
add tests to exercise Git/JGit reftable compatibility, 2024-04-12).

 ci/lib.sh | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/ci/lib.sh b/ci/lib.sh
index 473a2d0348..273f3540a6 100755
--- a/ci/lib.sh
+++ b/ci/lib.sh

@@ -325,9 +325,13 @@ ubuntu-*)
 		break
 	fi
 
-	PYTHON_PACKAGE=python2
-	if test "$jobname" = linux-gcc
+	# Python 2 is end of life, and Ubuntu 23.04 and newer don't actually
+	# have it anymore. We thus only test with Python 2 on older LTS
+	# releases.
+	if "$distro" = "ubuntu-20.04"
 	then
+		PYTHON_PACKAGE=python2
+	else
 		PYTHON_PACKAGE=python3
 	fi
 	MAKEFLAGS="$MAKEFLAGS PYTHON_PATH=/usr/bin/$PYTHON_PACKAGE"

base-commit: b6db6b1598946fbf777e55ff0d187b11ff3bd21f
-- 
2.45.0