Add Go to workflow

.github/workflows/docker.yml

@@ -27,6 +27,10 @@ jobs:
         git config --local user.email "action@github.com"
         git config --local user.name "GitHub Action"
 
+    - name: Install Go 
+      run: |
+        apk add --no-cache go
+
     - name: Regenerate Dockerfiles
       run: |
         go run update.go -dockerfiles