chore(ci): skip metadata validation on main for testing

Bypass metadata-only validation for PRs targeting main and note the skip in the publish comment so testing can proceed without metadata validation noise.

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

Author: rostalan

.github/workflows/auto-publish-pr.yaml

@@ -199,7 +199,8 @@ jobs:
       - detect-changes
     if: |
       needs.prepare.outputs.workspace != '' &&
-      needs.detect-changes.outputs.only-metadata-changed == 'true'
+      needs.detect-changes.outputs.only-metadata-changed == 'true' &&
+      needs.prepare.outputs.target-branch != 'main'
     runs-on: ubuntu-latest
 
     outputs:
@@ -349,6 +350,7 @@ jobs:
           INPUT_OVERLAY_COMMIT: ${{ needs.prepare.outputs.overlay-commit }}
           INPUT_OVERLAY_REPO: ${{ needs.prepare.outputs.overlay-repo }}
           INPUT_OVERLAY_BRANCH: ${{ needs.prepare.outputs.overlay-branch }}
+          INPUT_TARGET_BRANCH: ${{ needs.prepare.outputs.target-branch }}
           INPUT_WORKSPACE: ${{ needs.prepare.outputs.workspace }}
           INPUT_PR_NUMBER: ${{ needs.prepare.outputs.pr-number }}
           INPUT_PUBLISHED_EXPORTS: ${{ needs.export.outputs.published-exports }}
@@ -367,6 +369,8 @@ jobs:
             const fs = require('fs');
             const prNumber = Number(core.getInput('pr_number'));
             const onlyMetadataChanged = core.getInput('only_metadata_changed') === 'true';
+            const targetBranch = core.getInput('target_branch');
+            const skipMetadataValidationForTesting = targetBranch === 'main';
             const checkUpToDateResult = core.getInput('check_up_to_date_result');
             const exportResult = core.getInput('export_result');
             const checkBackstageCompatibilityResult = core.getInput('check_backstage_compatibility_result');
@@ -441,7 +445,9 @@ jobs:
             const metadataValidationErrorCount = core.getInput('metadata_validation_error_count');
             const metadataValidationErrorsJson = core.getInput('metadata_validation_errors');
 
-            if (metadataValidationPassed === 'true') {
+            if (skipMetadataValidationForTesting) {
+              body += '\n\n#### Metadata Validation\n⚠️ Skipped on `main` for testing.';
+            } else if (metadataValidationPassed === 'true') {
               body += '\n\n#### Metadata Validation\n✅ All metadata files validated successfully.';
             } else if (metadataValidationErrorCount && metadataValidationErrorCount !== '0') {
               let metadataSection = '\n\n#### Metadata Validation\n';