Add Docker build workflow

Author: azaidelson

.github/workflows/docker-build-secretvm.yml

@@ -2,8 +2,14 @@ name: Build and Push Docker Image
 
 on:
   push:
+    branches:
+      - master
     tags: "v[0-9]+.[0-9]+.[0-9]+"
 
+permissions:
+  contents: write
+  packages: write
+
 jobs:
   build-and-push:
     runs-on: ubuntu-latest
@@ -61,7 +67,7 @@ jobs:
             app:
               image: ghcr.io/${{ steps.set_repo.outputs.REPO_NAME }}@sha256:${{ steps.push.outputs.IMAGE_HASH }}
               ports:
-                - '3000:80'
+                - '8000:8000'
           EOL
 
       - name: Commit docker-compose-secretvm.yaml