build(workflows): only run when changes

.github/workflows/nightly.yml

@@ -6,7 +6,23 @@ on:
   workflow_dispatch:
 
 jobs:
+  check:
+    runs-on: ubuntu-22.04
+    outputs:
+      nightly: ${{ steps.nightly.outputs.nightly }}
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - id: nightly
+        name: Check if current branch is nightly
+        run: (git tag --points-at HEAD | grep -wq "nightly" && echo "nightly=true") || echo "nightly=false" >> $GITHUB_OUTPUT
+
   nightly:
+    needs: [check]
+    if: ${{ needs.check.outputs.nightly == 'false' }}
     permissions:
       contents: write
     runs-on: ubuntu-22.04