Update sign workflow

Author: Mikhail

.github/workflows/docker.yml

@@ -80,7 +80,7 @@ jobs:
           args: buildAll
 
       - name: Sign plugin
-        run: yarn run grafana-toolkit plugin:sign
+        run: yarn sign
         env:
           GRAFANA_API_KEY: ${{ secrets.GRAFANA_API_KEY }} # Requires a Grafana API key from Grafana.com.
 

package.json

@@ -22,6 +22,7 @@
     "build": "grafana-toolkit plugin:build --coverage",
     "dev": "grafana-toolkit plugin:dev",
     "format": "prettier --write \"**\"",
+    "sign": "grafana-toolkit plugin:sign",
     "start": "docker-compose up",
     "start:dev": "docker-compose -f docker-compose/dev.yml up",
     "stop": "docker-compose down",