save unique cache

Author: ankitk-me

.github/workflows/build.yml

@@ -48,7 +48,11 @@ jobs:
       if: success()
       with:
         path: ~/docker-cache/docker.tar
-        key: docker-${{ runner.os }}-zilla-develop-SNAPSHOT
+        key: zilla-develop-SNAPSHOT-${{ hashFiles('~/docker-cache/docker.tar') }}
+
+    - name: Compute Unique Cache Key
+      id: cache-key
+      run: echo "cache_key=zilla-develop-SNAPSHOT-${{ hashFiles('~/docker-cache/docker.tar') }}" >> "$GITHUB_OUTPUT"
 
     - name: Conditional Artifact Upload
       uses: actions/upload-artifact@v4
@@ -105,7 +109,7 @@ jobs:
         uses: actions/cache@v4
         with:
           path: ~/docker-cache/docker.tar
-          key: docker-${{ runner.os }}-zilla-develop-SNAPSHOT
+          key: ${{ needs.build.outputs.cache_key }}
 
       - name: Load cached Docker image
         run: |