Using $GITHUB_ACTION_PATH env var instead of ${{ github.action_path }} context

[way-dave]

When running in a container, ${{ github.action_path }} resolves to the wrong location:

python3: can't open file '/home/runner/work/_actions/advanced-security/filter-sarif/v1/filter_sarif.py': [Errno 2] No such file or directory

Using the environmental variable works.

According to actions/runner#716, this change should not be needed. But it is! 🤷

[jstsddg]

Thanks for the fix! My team is having the same issue, can this PR somehow be pushed forward?
/CC @zbazztian

[way-dave]

Thanks for the merge! When can we expect to see this available on the v1 tag?

[aegilops]

It's now on each of the v1.0.1, v1.0 and v1 tags