fix: target variable

.github/workflows/ci.yaml

@@ -95,14 +95,16 @@ jobs:
 
        # Forcing execution delete after checking it works!!
       - name: Clean Docker cache
+        env: 
+          TARGET: ${{ runner.os }}-buildx-v1.0-service-node-${{ github.ref_name }} 
         run: |
-          target=${{ runner.os }}-buildx-v1.0-service-node-${{ github.ref_name }}
           curl -L \
           -X DELETE \
           -H "Accept: application/vnd.github+json" \
           -H "Authorization: Bearer ${{ secrets.GITHUB_TOKEN }}" \
           -H "X-GitHub-Api-Version: 2022-11-28" \
-          https://api.github.com/repos/pantos-io/service-node/actions/caches?key=$TARGET
+          "https://api.github.com/repos/pantos-io/service-node/actions/caches?key=${{ env.TARGET }}"
+
 
   build:
     uses: ./.github/workflows/build.yml