deps: bump Go version in Dockerfiles

[stanley-cheung]

#8509 (e847f29#diff-ec20ea664a5618c21b884b2b3845c9e8bd35c303456b92527be9d004529eb138) broke the observability tests (https://fusion2.corp.google.com/ci/kokoro/prod:grpc-gcp%2Ftools%2Fobservability%2Fmaster%2Fcontinuous_go/activity/94077d7d-4594-4509-abd8-73f967fb41ba/log)

This should fix it.

RELEASE NOTES: N/A

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.83%. Comparing base (9ac0ec8) to head (f76ce3a).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8522      +/-   ##
==========================================
+ Coverage   81.82%   81.83%   +0.01%     
==========================================
  Files         413      412       -1     
  Lines       40518    40518              
==========================================
+ Hits        33153    33159       +6     
+ Misses       5989     5962      -27     
- Partials     1376     1397      +21     

see 232 files with indirect coverage changes

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[arjan-bal]

It looks like we've also broken the PSM interop tests. @stanley-cheung, could you please bump the Go version to Go 1.25 on all the Dockerfiles? This would give us more time before we need to update the version again.

Reference PR: https://github.com/grpc/grpc-go/pull/7629/files

[stanley-cheung]

It looks like we've also broken the PSM interop tests. @stanley-cheung, could you please bump the Go version to Go 1.25 on all the Dockerfiles? This would give us more time before we need to update the version again.

Reference PR: https://github.com/grpc/grpc-go/pull/7629/files

Done. Thanks for the reference.

[arjan-bal]

It looks like golang:1.25-bullseye is not published yet.

$ docker pull golang:1.25-bullseye
Error response from daemon: manifest for golang:1.25-bullseye not found: manifest unknown: manifest unknown

$ docker pull golang:1.24-bullseye
1.24-bullseye: Pulling from library/golang
078965fc7cf3: Pull complete 
8620e616831b: Pull complete 
99bdf4e3059e: Pull complete 
79e3925f0bdb: Pull complete 
9a940d118df6: Pull complete 
25ac2e409764: Pull complete 
4f4fb700ef54: Pull complete 
Digest: sha256:2cdc80dc25edcb96ada1654f73092f2928045d037581fa4aa7c40d18af7dd85a
Status: Downloaded newer image for golang:1.24-bullseye
docker.io/library/golang:1.24-bullseye

We can use golang:1.25-alpine here also. I tried building with the alpine image and it worked.

TAG_NAME="gcr.io/a/b"
docker build --no-cache -t ${TAG_NAME} -f ./interop/observability/Dockerfile .

[stanley-cheung]

Fixed thanks.

[arjan-bal]

I just realized that this Dockerfile is using bullseye because the entrypoint is a bash script. Since alpine images don't have Bash, we'll need to use golang:1.24-bullseye instead. My apologies for the incorrect suggestion

[stanley-cheung]

No problem. I had the tinkering something was off - you got it right.

[arjan-bal]

LGTM

[stanley-cheung]

Can confirm that the grpc observability test are back to passing after this fix. Thanks