fix: Adds step to close existing PRs. (#227)

Author: willum070

.github/workflows/release.yml

@@ -64,6 +64,16 @@ jobs:
       - name: Deploy to Firebase Hosting
         run: firebase deploy --only hosting
 
+      - name: Close Existing PRs (temp-build-branch to main)
+        run: |
+          EXISTING_PR=$(gh pr list --base main --head temp-build-branch --state open --json number -q '.[].number')
+          if [[ -n "$EXISTING_PR" ]]; then
+            echo "Found existing open PR(s) for temp-build-branch to main: $EXISTING_PR"
+            gh pr close "$EXISTING_PR"
+          fi
+        env:
+          GH_TOKEN: ${{ secrets.GH_MERGE_TOKEN }}
+
       - name: Create temporary branch
         run: git checkout -b temp-build-branch