ci: increase trivy fs scan timeout to 30m

Slow ARM64 runners hit the default timeout while downloading the Trivy
checks bundle and analyzing workflow YAML files. Extend the timeout so
PR checks can complete reliably.

.gitea/workflows/pr-checks.yml

@@ -65,7 +65,7 @@ jobs:
       - name: Trivy filesystem security scan
         run: |
           set +e
-          trivy fs --scanners vuln,misconfig,secret --exit-code 1 --severity HIGH,CRITICAL . 2>&1 | tee trivy-scan.log
+          trivy fs --timeout 30m --scanners vuln,misconfig,secret --exit-code 1 --severity HIGH,CRITICAL . 2>&1 | tee trivy-scan.log
           trivy_exit="${PIPESTATUS[0]}"
           if ! grep -Eq "Number of language-specific files[[:space:]]+num=[1-9][0-9]*" trivy-scan.log; then
             echo "::error::Trivy did not detect any language-specific dependency files."