chore: fix PR ABI validation logic (#109)

Author: Aliorpse

.github/workflows/pr_validation.yml

@@ -10,15 +10,13 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v4
-        with:
-          ref: ${{ github.event.pull_request.head.sha }}
-
       - name: Check Review Status
         id: check_reviews
         uses: actions/github-script@v7
         with:
           script: |
+            core.setOutput('should_run', 'false');
+
             const { data: reviews } = await github.rest.pulls.listReviews({
               owner: context.repo.owner,
               repo: context.repo.repo,
@@ -33,14 +31,19 @@ jobs:
             const states = Object.values(latestReviews);
             const allApproved = states.length > 0 && states.every(state => state === 'APPROVED');
 
-            if (!allApproved) {
-              console.log("Skipping ABI validation because not all reviewers approved.");
-              core.setOutput('should_run', 'false');
-            } else {
+            if (allApproved) {
               console.log("All reviewers approved. Proceeding with validation.");
               core.setOutput('should_run', 'true');
+            } else {
+              console.log("Skipping ABI validation because not all reviewers approved.");
+              core.setOutput('should_run', 'false');
             }
 
+      - uses: actions/checkout@v4
+        if: steps.check_reviews.outputs.should_run == 'true'
+        with:
+          ref: ${{ github.event.pull_request.head.sha }}
+
       - name: Set up JDK
         if: steps.check_reviews.outputs.should_run == 'true'
         uses: actions/setup-java@v4
@@ -55,4 +58,4 @@ jobs:
 
       - name: ABI Validation
         if: steps.check_reviews.outputs.should_run == 'true'
-        run: ./gradlew checkLegacyAbi -Pfull-build=true --no-configuration-cache
+        run: ./gradlew checkLegacyAbi -Pfull-build=true --no-configuration-cache