Added a workflow

so as to automatically release then the tags are pushed.

.github/workflows/release.yml

@@ -0,0 +1,18 @@
+---
+name: Release
+
+on:
+  push:
+    tags:
+      - '*.*.*'
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: checkout
+        uses: actions/checkout@v2
+      - name: galaxy
+        uses: robertdebock/galaxy-action@1.1.0
+        with:
+          galaxy_api_key: ${{ secrets.galaxy_api_key }}