[ci] Update guard condition in publish-performance-history to simplify testing scenarios

Author: orionpapadakis

.github/workflows/build-and-run.yml

@@ -534,10 +534,14 @@ jobs:
 
   # ── Separate job: collect all matrix metrics and update history ───────────────
   publish-performance-history:
-    if: |
-      github.repository == 'beehive-lab/GPULlama3.java' &&
-      github.event_name == 'push' &&
-      github.ref == 'refs/heads/main'
+    # Guard: only commit history on real pushes to main, not on PRs or forks.
+    # Prevents duplicate entries from PR runs and avoids push-permission errors on forks.
+    # Full guard (restore after testing):
+#    if: |
+#      github.repository == 'beehive-lab/GPULlama3.java' &&
+#      github.event_name == 'push' &&
+#      github.ref == 'refs/heads/main'
+    if: github.repository == 'beehive-lab/GPULlama3.java'
     runs-on: [self-hosted]
     needs: build-and-run
     timeout-minutes: 15