Merge branch 'epic/v3' of github.com:DesignSafe-CI/DS-User-Guide into epic/v3

Author: wesleyboar

.github/workflows/validate-requirements.yml

@@ -0,0 +1,32 @@
+name: Validate `requirements.txt`
+
+on:
+  pull_request:
+  push:
+
+jobs:
+  check-requirements:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 2
+
+      - name: Check if requirements.txt was modified unexpectedly
+        run: |
+          # Get author of last commit
+          AUTHOR=$(git log -1 --pretty=format:'%an')
+
+          # Check if requirements.txt was modified in last commit
+          if git diff --name-only HEAD~1 HEAD | grep -q "^requirements.txt$"; then
+            if [ "$AUTHOR" != "github-actions[bot]" ]; then
+              echo "❌ ERROR: You may NOT edit `requirements.txt`"
+              echo "To pin dependencies, use `poetry add <package-name>`."
+              echo "Please remove your changes to requirements.txt, so the robot can maintain it."
+              exit 1
+            fi
+          fi
+
+          echo "✅ SUCCESS: `requirements.txt` not modified unexpectedly"