check for tag before running release job

Signed-off-by: Alexis Tyler <xo@wvvw.me>

.github/workflows/ci.yml

@@ -42,6 +42,10 @@ jobs:
         node-version: [10.x]
 
     steps:
+    - name: Check if tag
+      run: |
+        # Bail if this push doesn't include a tag
+        [[ "$GITHUB_REF" != refs/tags/* ]] && echo "${GITHUB_REF} is not a tag, exiting..." && exit 78
     - name: Checkout repo
       uses: actions/checkout@v1
     - name: Use Node.js ${{ matrix.node-version }}