added Galaxy file

Signed-off-by: Mark Bolwell <mark.bollyuk@gmail.com>

.github/workflows/update_galaxy.yml

@@ -0,0 +1,21 @@
+---
+
+# This is a basic workflow to help you get started with Actions
+
+name: update galaxy
+
+# Controls when the action will run.
+# Triggers the workflow on merge request events to the main branch
+on:
+  push:
+    branches:
+      - main
+jobs:
+    update_role:
+      runs-on: ubuntu-latest
+      steps:
+        - uses: actions/checkout@v3
+        - uses: robertdebock/galaxy-action@master
+          with:
+            galaxy_api_key: ${{ secrets.GALAXY_API_KEY }}
+            git_branch: main