[PATCH 2/2] ci: bump ubuntu image version for static-analysis job

We recently ran into a case[1] where old versions of coccinelle ran very
slowly, but newer ones are fine. The version we use in GitHub's CI was
the old slow version, leading to timeouts of the static-analysis job.

We get the old version because we ask for the ubuntu-22.04 image. That
has coccinelle 1.1.1, but the "fast" improvement is in coccinelle 1.3.0,
specifically their 58619b8fe (break up envs for e1 & e2, 2024-08-18).

Bumping to ubuntu-25.10 would be enough to get that new version. But I
don't see any need to ask for a specific version at all. We originally
used a specific version because coccinelle wasn't available in ubuntu
20.04, so we pinned to 18.04 in d051ed77ee (.github/workflows/main.yml:
run static-analysis on bionic, 2021-02-08). Later that got bumped in
ef46584831 (ci: update 'static-analysis' to Ubuntu 22.04, 2022-08-23)
when 18.04 support was dropped.

It seems like the absence of coccinelle was a blip in 20.04, and we can
just stick with "latest" going forward.

I tested the result on GitHub's CI. I bumped the matching line in the
GitLab definition, but didn't have a simple means of testing (but it's
such a trivial change nothing could go wrong, right?).

[1] https://lore.kernel.org/git/20260724091152.27794-2-tnyman@openai.com/ (local)

Signed-off-by: Jeff King <redacted>
---
 .github/workflows/main.yml | 4 ++--
 .gitlab-ci.yml             | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 85cfedf5b0..205325eb33 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml

@@ -460,8 +460,8 @@ jobs:
     if: needs.ci-config.outputs.enabled == 'yes'
     env:
       jobname: StaticAnalysis
-      CI_JOB_IMAGE: ubuntu-22.04
-    runs-on: ubuntu-22.04
+      CI_JOB_IMAGE: ubuntu-latest
+    runs-on: ubuntu-latest
     concurrency:
       group: static-analysis-${{ github.ref }}
       cancel-in-progress: ${{ needs.ci-config.outputs.skip_concurrent == 'yes' }}

diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 1c4d04da9d..0242283c3c 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml

@@ -227,7 +227,7 @@ test:fuzz-smoke-tests:
     - ./ci/run-build-and-minimal-fuzzers.sh
 
 static-analysis:
-  image: ubuntu:22.04
+  image: ubuntu:latest
   stage: analyze
   needs: [ ]
   variables:

-- 
2.55.0.742.gf2bff09aa6