refactor: simpplify reqs-validate

Author: wesleyboar

.github/workflows/reqs-validate.yml

@@ -9,25 +9,32 @@ jobs:
   reject-drift:
     runs-on: ubuntu-latest
 
+    # Skip if the last commit was from the bot (prevent unnecessary check)
+    if: github.event.head_commit.author.name != 'github-actions[bot]'
+
     steps:
       - name: Checkout code
         uses: actions/checkout@v4
         with:
-          fetch-depth: 2
+          fetch-depth: 0  # full history
 
       - name: Check if requirements.txt was modified unexpectedly
         run: |
-          # Get author of last commit
-          AUTHOR=$(git log -1 --pretty=format:'%an')
+          # For PRs, check against base branch
+          # For pushes, check last commit
+          if [ "${{ github.event_name }}" = "pull_request" ]; then
+            BASE_REF="${{ github.event.pull_request.base.sha }}"
+            COMPARE_RANGE="$BASE_REF...HEAD"
+          else
+            COMPARE_RANGE="HEAD~1..HEAD"
+          fi
 
-          # Check if requirements.txt was modified in last commit
-          if git diff --name-only HEAD~1 HEAD | grep -q "^requirements.txt$"; then
-            if [ "$AUTHOR" != "github-actions[bot]" ]; then
-              echo "::error::You may NOT edit 'requirements.txt'"
-              echo "::warning::Undo your changes to requirements.txt, so robot can maintain it."
-              echo "::notice::To pin dependencies, use 'poetry add <package-name>'."
-              exit 1
-            fi
+          # If requirements.txt modified in that range
+          if git diff --name-only $COMPARE_RANGE | grep -q "^requirements.txt$"; then
+            echo "::error::You may NOT edit 'requirements.txt'"
+            echo "::warning::Undo your changes to requirements.txt, so robot can maintain it."
+            echo "::notice::To pin dependencies, use 'poetry add <package-name>'."
+            exit 1
           fi
 
-          echo "`requirements.txt` unchanged"
+          echo "'requirements.txt' unchanged (or only changed by bot)"