maybe like this?

Author: goergisn

action.yml

@@ -21,7 +21,7 @@ runs:
       uses: actions/cache@v3
       with:
         path: |
-            $(swift build --configuration release --show-bin-path)
+            swift build --configuration release --show-bin-path
         key: ${{ runner.os }}-swift-build-6ec5ba25648323a388a756636e7f668b04d9f615
         #key: ${{ runner.os }}-swift-build-${{ github.sha }}
     - name: "Run Diff"