Add cache step for buildah layers

Add caching for buildah layers to improve build performance.

.github/workflows/build.yml

@@ -97,6 +97,19 @@ jobs:
           sep-tags: " "
           sep-annotations: " "
 
+          # Hinzufügen vor dem "Build Image" Schritt:
+      - name: Cache buildah layers
+        uses: actions/cache@v4
+        with:
+          path: |
+            /var/lib/containers/storage/overlay
+            ~/.cache/buildah
+            /tmp/.buildah-cache
+          key: ${{ runner.os }}-${{ github.workflow }}-${{ hashFiles('Containerfile') }}-${{ github.ref }}
+          restore-keys: |
+            ${{ runner.os }}-${{ github.workflow }}-${{ hashFiles('Containerfile') }}-
+
+
       - name: Build Image
         id: build_image
         uses: redhat-actions/buildah-build@7a95fa7ee0f02d552a32753e7414641a04307056 # v2