also push major version tag (#114)

* push major tag

* remove ::set-env

.github/workflows/docker-image-push.yml

@@ -40,14 +40,17 @@ jobs:
             EXTRA_ARG+=("--push")
             VERSION="$(git describe --exact-match --tags)"
             TAG="${VERSION}"
+            MAJOR_TAG="$(echo "$VERSION" | sed -nre 's/^([0-9]+).*/\1/p')"
             LATEST_TAG="latest"
             if grep -q "^alpine/" <<< "${{ matrix.dockerfile }}"; then
               TAG="${TAG}-alpine"
+              MAJOR_TAG="${MAJOR_TAG}-alpine"
               LATEST_TAG="alpine"
             fi
-            # If not a pre-release push LATEST_TAG
+            # If not a pre-release push LATEST_TAG & MAJOR_TAG
             if grep -qE "^[0-9]*\.[0-9]*\.[0-9]*$" <<< "${VERSION}"; then
               EXTRA_ARG+=("--tag" "${DOCKER_REPOSITORY}:${LATEST_TAG}")
+              EXTRA_ARG+=("--tag" "${DOCKER_REPOSITORY}:${MAJOR_TAG}")
             fi
           fi
           docker buildx build \

.github/workflows/docker-image-test.yml

@@ -11,7 +11,7 @@ jobs:
         dockerfile: [Dockerfile, alpine/Dockerfile]
     steps:
       - name: Set env
-        run: echo "::set-env name=mount_dir::$(mktemp -d)"
+        run: echo "mount_dir=$(mktemp -d)" >> $GITHUB_ENV
 
       - name: Checkout
         uses: actions/checkout@v1