refactor: Make workflows reusable for external repositories

This change refactors the GitHub Actions workflows to support 'workflow_call' triggers, making them self-contained and portable for use in external repositories.

Key changes:
- Added 'workflow_call' triggers to all relevant workflows with inputs to configure behavior like checkout paths, build matrices, and relevance check skipping.
- Replaced hardcoded 'phlex' references with dynamic repository information.
- Ensured workflows remain backward-compatible with existing triggers.
- Fixed an issue with constructing CMake sanitizer options by correctly extracting the repository name from the full 'owner/repo' string.
- Corrected the relevance check in `actionlint-check.yaml` to handle pull request context from `workflow_call`.
- Updated workflows to explicitly check out the 'phlex' repository for ancillary scripts or to use canonical remote paths for reusable actions, ensuring they are self-contained.

Author: google-labs-jules[bot]

.github/workflows/cmake-format-fix.yaml

@@ -75,7 +75,7 @@ jobs:
           gersemi -i ${{ env.local-checkout-path }}
 
       - name: Handle fix commit
-        uses: ./${{ env.local-checkout-path }}/.github/actions/handle-fix-commit
+        uses: Framework-R-D/phlex/.github/actions/handle-fix-commit@main
         with:
           tool: cmake-format
           working-directory: phlex-src

.github/workflows/codeql-analysis.yaml

@@ -135,6 +135,14 @@ jobs:
         with:
           fetch-depth: 0
 
+      - name: Checkout Phlex for scripts
+        if: github.event_name == 'workflow_call'
+        uses: actions/checkout@1af3b93b6815bc44a9784bd300feb67ff0d1eeb3 # v6.0.0
+        with:
+          repository: Framework-R-D/phlex
+          path: phlex
+          fetch-depth: 0
+
       - name: Download CodeQL SARIF artifacts
         uses: actions/download-artifact@37930b1c2abaa49bbe596cd826c3c89aef350131 # v7.0.0
         with:
@@ -161,7 +169,12 @@ jobs:
           if [ -n "$PR_NUMBER" ]; then
             ARGS+=(--ref "refs/pull/${PR_NUMBER}/merge")
           fi
-          python3 scripts/check_codeql_alerts.py "${ARGS[@]}"
+
+          script_path="scripts/check_codeql_alerts.py"
+          if [ "${{ github.event_name }}" = "workflow_call" ]; then
+            script_path="phlex/$script_path"
+          fi
+          python3 "$script_path" "${ARGS[@]}"
 
       - name: Upload CodeQL alerts debug log
         if: always()

.github/workflows/python-fix.yaml

@@ -79,7 +79,7 @@ jobs:
           ruff check --fix . || true
 
       - name: Handle fix commit
-        uses: ./${{ env.local-checkout-path }}/.github/actions/handle-fix-commit
+        uses: Framework-R-D/phlex/.github/actions/handle-fix-commit@main
         with:
           tool: 'Python linting'
           working-directory: phlex-src