Add error handling and race condition protection to deployment workflow

Co-authored-by: ckenst <6896787+ckenst@users.noreply.github.com>

Author: Copilot

.github/workflows/deploy.yml

@@ -31,6 +31,12 @@ jobs:
       - name: Read and Increment Version
         id: version
         run: |
+          # Check if VERSION.txt exists
+          if [ ! -f _includes/VERSION.txt ]; then
+            echo "ERROR: _includes/VERSION.txt not found"
+            exit 1
+          fi
+          
           # Read current version
           CURRENT_VERSION=$(cat _includes/VERSION.txt)
           echo "Current version: $CURRENT_VERSION"
@@ -64,13 +70,24 @@ jobs:
           git config user.name "github-actions[bot]"
           git config user.email "github-actions[bot]@users.noreply.github.com"
           git add _includes/VERSION.txt
-          git commit -m "chore: bump version to ${{ steps.version.outputs.version }}" || echo "No changes to commit"
-          git push
+          
+          # Only commit and push if there are changes
+          if git diff --staged --quiet; then
+            echo "No changes to commit"
+          else
+            git commit -m "chore: bump version to ${{ steps.version.outputs.version }}"
+            git push
+          fi
 
       - name: Create Git Tag
         run: |
-          git tag -a "v${{ steps.version.outputs.version }}" -m "Release version ${{ steps.version.outputs.version }}"
-          git push origin "v${{ steps.version.outputs.version }}"
+          # Check if tag already exists (could happen with concurrent runs)
+          if git rev-parse "v${{ steps.version.outputs.version }}" >/dev/null 2>&1; then
+            echo "Tag v${{ steps.version.outputs.version }} already exists, skipping tag creation"
+          else
+            git tag -a "v${{ steps.version.outputs.version }}" -m "Release version ${{ steps.version.outputs.version }}"
+            git push origin "v${{ steps.version.outputs.version }}"
+          fi
 
       - name: Upload artifact
         uses: actions/upload-pages-artifact@v3