feat(github-actions): add script to get latest tag for current commit

Add a Bash script to retrieve the latest Git tag associated with the
current commit. The script configures Git user information, extracts
the current commit hash, finds any tags pointing at the commit, and
displays the most recent tag if available.

Assumptions:
- Tags are annotated and follow a time-based ordering.

.github/workflows/tag_after_test.yml

@@ -46,6 +46,7 @@ jobs:
       - name: Determine next version
         id: determine_next_version
         run: |
+          chmod +x ./scripts/git/commit_tag.sh
           LATEST_TAG=$(./scripts/git/commit_tag.sh)
           if [[ -z "$LATEST_TAG" ]]; then
             NEXT_TAG="v0.0.1"