Add Set up go step to Build backend

Author: mikhail-vl

.github/workflows/main.yml

@@ -10,21 +10,30 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v2
+      - name: Checkout
+        uses: actions/checkout@v2
 
       - name: Setup Node.js environment
         uses: actions/setup-node@v2.1.2
         with:
           node-version: 12.x
 
+      - name: Set up Go
+        uses: actions/setup-go@v2
+        with:
+          go-version: 1.14
+          
       - name: Install dependencies
         run: yarn install
 
       - name: Build plugin
         run: yarn build
 
       - name: Build backend
-        run: mage -v buildAll
+        uses: magefile/mage-action@v1
+        with:
+          version: latest
+          args: buildAll
 
       - name: Sign plugin
         run: npx @grafana/toolkit@canary plugin:sign
@@ -95,4 +104,4 @@ jobs:
         run: |
           echo Publish your plugin to grafana.com/plugins by opening a PR to https://github.com/grafana/grafana-plugin-repository with the following entry:
           echo
-          echo '{ "id": "${{ env.GRAFANA_PLUGIN_ID }}", "type": "${{ env.GRAFANA_PLUGIN_TYPE }}", "url": "https://github.com/${{ github.repository }}", "versions": [ { "version": "${{ env.GRAFANA_PLUGIN_VERSION }}", "commit": "${{ github.sha }}", "url": "https://github.com/${{ github.repository }}", "download": { "any": { "url": "${{ steps.upload-plugin-asset.outputs.browser_download_url }}", "md5": "${{ env.GRAFANA_PLUGIN_CHECKSUM }}" } } } ] }' | jq .
+          echo '{ "id": "${{ env.GRAFANA_PLUGIN_ID }}", "type": "${{ env.GRAFANA_PLUGIN_TYPE }}", "url": "https://github.com/${{ github.repository }}", "versions": [ { "version": "${{ env.GRAFANA_PLUGIN_VERSION }}", "commit": "${{ github.sha }}", "url": "https://github.com/${{ github.repository }}", "download": { "any": { "url": "${{ steps.upload-plugin-asset.outputs.browser_download_url }}", "md5": "${{ env.GRAFANA_PLUGIN_CHECKSUM }}" } } } ] }' | jq .