ci: check proceed condition for nightly

Author: yuchanns

.github/workflows/nightly.yml

@@ -12,8 +12,51 @@ on:
     - cron: '0 0 * * *'  # Runs every day at midnight UTC
 
 jobs:
+  check:
+    name: Determine Build Necessity
+    runs-on: ubuntu-latest
+    outputs:
+      proceed: ${{ steps.check.outputs.proceed }}
+    steps:
+      - uses: actions/checkout@v5
+        with:
+          fetch-depth: 0
+      - name: Get the last nightly commit
+        id: last_nightly
+        uses: actions/github-script@v7
+        with:
+          script: |
+            const release = await github.rest.repos.getReleaseByTag({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              tag: 'nightly'
+            }).catch(() => null);
+            if (release && release.data && release.data.target_commitish) {
+              return release.data.target_commitish;
+            } else {
+              return null;
+            }
+      - name: Check the proceed condition
+        id: check
+        run: |
+          LAST_NIGHTLY_COMMIT="${{ steps.last_nightly.outputs.result }}"
+          CURRENT_COMMIT="${GITHUB_SHA}"
+          echo "Last nightly commit: $LAST_NIGHTLY_COMMIT"
+          echo "Current commit: $CURRENT_COMMIT"
+          if [ -z "$LAST_NIGHTLY_COMMIT" ]; then
+            echo "No previous nightly release found. Proceeding with build."
+            echo "proceed=true" >> $GITHUB_OUTPUT
+          elif [ "$LAST_NIGHTLY_COMMIT" != "$CURRENT_COMMIT" ]; then
+            echo "New commits found since last nightly release. Proceeding with build."
+            echo "proceed=true" >> $GITHUB_OUTPUT
+          else
+            echo "No new commits since last nightly release. Skipping build."
+            echo "proceed=false" >> $GITHUB_OUTPUT
+          fi
   build:
     name: Nightly Build on ${{ matrix.os }}
+    needs: check
+    if: needs.check.outputs.proceed == 'true'
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
@@ -74,7 +117,7 @@ jobs:
           overwrite: "true"
   release:
     name: Create Nightly Release
-    needs: build
+    needs: [check, build]
     runs-on: ubuntu-latest
     if: github.event_name == 'workflow_dispatch' || github.event_name == 'schedule'
     permissions: