Fix the PR comments github actions. No longer comments on ALL PRs

Signed-off-by: Pedro Algarvio <palgarvio@vmware.com>

.github/workflows/pr-checks.yml

@@ -23,6 +23,10 @@ jobs:
           python -m pip install --upgrade pip
           pip install pre-commit pygithub
 
+      - name: Install Pre-Commit Hooks
+        run: |
+          pre-commit install --install-hooks
+
       - id: changed-files
         name: Get Changed Files
         uses: dorny/paths-filter@v2
@@ -38,11 +42,14 @@ jobs:
         id: check-known-missing-docstrings
         if: github.event_name == 'pull_request_target' && steps.changed-files.outputs.salt == 'true'
         continue-on-error: true
+        shell: bash
         run: |
+          set -o pipefail
           pre-commit run -v --hook-stage manual check-known-missing-docstrings --show-diff-on-failure --color=never --files ${{ join(fromJSON(steps.changed-files.outputs.salt_files), ' ') }} | tee output.txt
 
       - name: Comment on PR
-        if: hashFiles('output.txt') != ''
+        # Comment on PRs if pre-commit triggered a failure
+        if: steps.check-known-missing-docstrings.outcome == 'failure'
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         run: |