Fix use of safe.directory inside containers

[Flamefire]

Inside a container the actual workspace path is a mount point and not the same as outside the container. E.g.:

• ${{github.workspace}} == /home/runner/work/locale/locale
• $GITHUB_WORKSPACE == /__w/locale/locale

So it seems /home/runner/work is mounted at /__w and this is reflected by the environment variable but not the context. So use that variable instead.

Fixes #1767

[Flamefire]

@thomasrockhu-codecov Your change breaks this: $GITHUB_WORKSPACE is an environment variable not a context. And only the environment variable contains the value of the path inside the container, if one is used. Without a container it is the same as the context variable ${{github.workspace}}

[thomasrockhu-codecov]

@Flamefire can you link a PR with $GITHUB_WORKSPACE being filled in in a container? https://github.com/codecov/codecov-action/actions/runs/13388562452/job/37391004360?pr=1768#step:5:32

[Flamefire]

I had a test at #1767 (comment)
IIRC this was from https://github.com/boostorg/locale/actions/runs/13347288978/job/37279295461

Scroll to "Debug coverage" and see the output:

Canonical: /home/runner/work/locale/locale /__w/locale/locale

This is from https://github.com/boostorg/locale/blob/456e6e7be28c5e82b99b767ab2e48bebf470a8c0/.github/workflows/ci.yml#L371

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 0.00%. Comparing base (4898080) to head (5e61ec8).
Report is 2 commits behind head on main.

Additional details and impacted files

@@     Coverage Diff      @@
##   main   #1768   +/-   ##
============================
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[Flamefire]

Thank you for merging this! Is there any estimate for the next release? Then I'd rerun my job(s) using the action

[thomasrockhu-codecov]

@Flamefire some time this week, likely today or tomorrow