ci: require tugboat package version bump on PRs

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: Chinmay-KB

.github/workflows/version-bump-check.yml

@@ -0,0 +1,76 @@
+name: Version bump check
+
+on:
+  pull_request:
+    types: [opened, synchronize, reopened, ready_for_review]
+
+permissions:
+  contents: read
+
+jobs:
+  check-tugboat-version:
+    name: Require tugboat version bump
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Compare package version to base
+        env:
+          BASE_SHA: ${{ github.event.pull_request.base.sha }}
+          PACKAGE_PUBSPEC: packages/tugboat/pubspec.yaml
+        run: |
+          set -euo pipefail
+
+          extract_version() {
+            local file="$1"
+            if [[ ! -f "$file" ]]; then
+              echo ""
+              return
+            fi
+            grep -E '^version:' "$file" | head -1 | sed -E 's/^version:[[:space:]]*//' | tr -d '"' | tr -d "'" | tr -d '[:space:]'
+          }
+
+          if [[ ! -f "$PACKAGE_PUBSPEC" ]]; then
+            echo "::error::$PACKAGE_PUBSPEC is missing on this branch"
+            exit 1
+          fi
+
+          head_version="$(extract_version "$PACKAGE_PUBSPEC")"
+          if [[ -z "$head_version" ]]; then
+            echo "::error::Could not read version from $PACKAGE_PUBSPEC"
+            exit 1
+          fi
+
+          base_file="$(mktemp)"
+          if ! git show "${BASE_SHA}:${PACKAGE_PUBSPEC}" >"$base_file" 2>/dev/null; then
+            echo "Base branch has no $PACKAGE_PUBSPEC; treating as new package (ok)."
+            echo "PR version: $head_version"
+            exit 0
+          fi
+
+          base_version="$(extract_version "$base_file")"
+          rm -f "$base_file"
+
+          if [[ -z "$base_version" ]]; then
+            echo "::error::Could not read version from base $PACKAGE_PUBSPEC"
+            exit 1
+          fi
+
+          echo "Base version: $base_version"
+          echo "PR version:   $head_version"
+
+          if [[ "$head_version" == "$base_version" ]]; then
+            echo "::error::packages/tugboat version must be bumped before merge (still $base_version)."
+            exit 1
+          fi
+
+          higher="$(printf '%s\n%s\n' "$base_version" "$head_version" | sort -V | tail -n 1)"
+          if [[ "$higher" != "$head_version" ]]; then
+            echo "::error::PR version ($head_version) must be greater than base ($base_version)."
+            exit 1
+          fi
+
+          echo "Version bump detected: $base_version -> $head_version"