[KYUUBI #7131] Print cached engine archives

### Why are the changes needed?

Recently, GHA fails frequently with downloading engines failure, this adds logs to display the cached engine archives.

### How was this patch tested?

I will monitor GHA failure after merging.

### Was this patch authored or co-authored using generative AI tooling?

No.

Closes #7131 from pan3793/gha-cache.

Closes #7131

87a38e0 [Cheng Pan] Print cached engine archives

Authored-by: Cheng Pan <chengpan@apache.org>
Signed-off-by: Cheng Pan <chengpan@apache.org>

Author: pan3793

.github/actions/cache-engine-archives/action.yaml

@@ -25,3 +25,6 @@ runs:
       with:
         path: /tmp/engine-archives
         key: engine-archives
+    - name: Show cached engine archives
+      shell: bash
+      run: ls -lh /tmp/engine-archives