Update Docker publish workflow

Author: 3cky

.github/workflows/docker-publish.yml

@@ -1,11 +1,12 @@
 name: docker publish
 
 on:
+  push:
+    tags: [ 'v[0-9].[0-9]+.[0-9]+' ]
   workflow_run:
     workflows: [ 'build' ]
     types: [ completed ]
     branches: [ 'master' ]
-    tags: [ 'v*' ]
 
 env:
   PLATFORMS: linux/amd64,linux/arm64,linux/arm/v7
@@ -42,7 +43,6 @@ jobs:
           images: ${{ env.IMAGE_NAME }}
           tags: |
             type=ref,event=branch
-            type=ref,event=pr
             type=semver,pattern={{version}}
             type=semver,pattern={{major}}.{{minor}}
             type=sha

README.md

@@ -150,7 +150,7 @@ docker run -d --privileged \
     -p 502:502 \
     -v /dev:/dev \
     -v /path/to/mbusd.conf:/etc/mbusd.conf \
-    3cky/mbusd
+    3cky/mbusd:latest
 ```
 
 where `/path/to/mbusd.conf` is the path to **mbusd** config file in the local filesystem.