Fix CI (#2043)

The `store-gradle-cache` job in the `gradle.yaml` GitHub workflow is missing a "checkout", this change adds it to fix CI.

Author: snazy

.github/workflows/gradle.yml

@@ -151,6 +151,7 @@ jobs:
       - quarkus-tests
       - integration-tests
     steps:
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
       - name: Set up JDK 21
         uses: actions/setup-java@c5195efecf7bdfc987ee8bae7a71cb8b11521c00 # v4
         with: