small change to gh actions

.github/workflows/build.yaml

@@ -14,18 +14,19 @@ jobs:
       - name: Prepare
         id: prep
         run: |
-          echo "building ref: $GITHUB_REF"
-
-          TAG=null
+          TAGS=null
           IMAGE=place1/wg-access-server
           if [[ "$GITHUB_REF" == refs/heads/master ]]; then
-            TAG="$IMAGE:master"
+            TAGS="$IMAGE:master"
           elif [[ "$GITHUB_REF" == refs/tags/* ]]; then
             VERSION="${REF#refs/tags/}"
-            TAG="$IMAGE:$VERSION,$IMAGE:latest"
+            TAGS="$IMAGE:$VERSION,$IMAGE:latest"
           fi
 
-          echo ::set-output name=tag::${TAG}
+          echo "building ref: $GITHUB_REF"
+          echo "docker images: $TAGS"
+
+          echo ::set-output name=tags::${TAGS}
 
       - name: Checkout
         uses: actions/checkout@v2
@@ -52,4 +53,4 @@ jobs:
           file: Dockerfile
           platforms: linux/amd64, linux/arm64, linux/arm/v7
           push: true
-          tags: ${{ steps.prep.outputs.tag }}
+          tags: ${{ steps.prep.outputs.tags }}