add permissions

Author: gvkhna

.github/workflows/publish.yml

@@ -8,6 +8,9 @@ on:
 jobs:
   build-and-push:
     runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
     steps:
     - name: Checkout code
       uses: actions/checkout@v2

README.md

@@ -1,5 +1,7 @@
 # Deploy
 
+[![Docker](https://github.com/gvkhna/postgis-vector/actions/workflows/publish.yml/badge.svg?branch=main)](https://github.com/gvkhna/postgis-vector/actions/workflows/publish.yml)
+
 ```
 ghcr.io/gvkhna/postgis-vector:latest
 ```