fail pipeline if unreleased changes in master

.github/workflows/check_unreleased_changes.yml

@@ -0,0 +1,29 @@
+name: Check for Unreleased Changes
+
+on:
+  pull_request:
+    branches:
+      - master
+
+jobs:
+  check_unreleased:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check for unreleased changes
+        env:
+          REPO: "Budibase/budibase"
+          TOKEN: ${{ secrets.GITHUB_TOKEN }} 
+        run: |
+          RELEASE_TIMESTAMP=$(curl -s -H "Authorization: token $TOKEN" \
+              "https://api.github.com/repos/$REPO/releases/latest" | \
+              jq -r .published_at)
+          COMMIT_TIMESTAMP=$(curl -s -H "Authorization: token $TOKEN" \
+              "https://api.github.com/repos/$REPO/commits/master" | \
+              jq -r .commit.committer.date)
+          RELEASE_SECONDS=$(date --date="$RELEASE_TIMESTAMP" "+%s")
+          COMMIT_SECONDS=$(date --date="$COMMIT_TIMESTAMP" "+%s")
+          if (( COMMIT_SECONDS > RELEASE_SECONDS )); then
+              echo "There are unreleased changes. Please release these changes before merging."
+              exit 1
+          fi
+          echo "No unreleased changes detected."