ci: introduced CACHE_NAME

.github/workflows/build-multiarch.yml

@@ -22,6 +22,8 @@ on:
 jobs:
   docker-buildx:
     runs-on: ubuntu-20.04
+    env:
+      CACHE_NAME: master
     steps:
       - name: Checkout
         uses: actions/checkout@v2.3.4
@@ -44,9 +46,9 @@ jobs:
         uses: actions/cache@v2.1.5
         with:
           path: /tmp/.buildx-cache
-          key: ${{ runner.os }}-buildx-${{ steps.meta.outputs.version }}-${{ github.sha }}
+          key: ${{ runner.os }}-buildx-${{ env.CACHE_NAME }}-${{ github.sha }}
           restore-keys: |
-            ${{ runner.os }}-buildx-${{ steps.meta.outputs.version }}-
+            ${{ runner.os }}-buildx-${{ env.CACHE_NAME }}-
 
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v1.1.0