ci: remove the unused ci.bazelrc

[xnox]

Summary

.github/workflows/ci.bazelrc opens with:

This file contains Bazel settings to apply on CI only.
It is referenced with a --bazelrc option in the call to bazel in ci.yaml

Nothing references it. grep -rn ci.bazelrc across the tree found exactly one hit — a pointer comment in //.bazelrc — and the file has not been touched since the initial commit. ci.yaml passes its CI settings inline through setup-bazel's bazelrc input instead:

bazelrc: |
  common --announce_rc --color=yes --enable_bzlmod
  test --test_output=errors

So none of the settings in the file have been taking effect. This removes it, along with the now-dangling comment in //.bazelrc.

What was in it, and where it stands

Setting	Status
build --announce_rc	already set inline in ci.yaml
test --test_output=errors	already set inline in ci.yaml
build --disk_cache=~/.cache/bazel	never persisted between runs; nothing restores or saves that directory
test --test_env=XDG_CACHE_HOME	not covered elsewhere — see below

The disk cache entry is also self-contradictory in a way worth noting: its comment says "We do not enable the repository cache to cache downloaded external artifacts as these are generally faster to download again." ci.yaml sets repository-cache: true, so current practice is the opposite of what the file documents.

--test_env=XDG_CACHE_HOME is the one setting not duplicated in ci.yaml. Its comment says it exists to let tests run bazelisk-in-bazel; there are no such tests in the repo (no hits for bazelisk or XDG_CACHE_HOME in any .bzl, BUILD, or shell file), and the suite passes without it — as it has been doing all along, since the file was never applied. If a bazelisk-in-bazel test is added later, that setting can go into ci.yaml's inline block where it will actually apply.

Test plan

• grep -rn ci.bazelrc across the tree returns nothing
• bazel build //examples/wolfi-base succeeds, confirming //.bazelrc still parses after the comment removal

No behaviour change: a file that was never loaded cannot change behaviour by being deleted.

🤖 Generated with Claude Code