added image build workflow

.gitea/workflow/build-image.yml

@@ -0,0 +1,35 @@
+name: Image Build
+
+on:
+  push:
+    branches: [ main ]
+  workflow_dispatch:
+
+defaults:
+  run:
+    shell: sh 
+
+jobs:
+  docker:
+    runs-on: docker-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+
+      - name: Docker Login
+        run: |
+          echo "${{ secrets.REGISTRY_PASSWORD }}" | docker login git.protron.dev \
+            -u "${{ secrets.REGISTRY_USER }}" --password-stdin
+      
+      - name: Docker build
+        run: |
+          docker build \
+             -t git.protron.dev/doc/vintagecontainer:latest \
+             -t git.protron.dev/doc/vintagecontainer:${GITHUB_SHA} \
+             .
+
+      - name: Docker push
+        run: |
+          docker push git.protron.dev/doc/vintagecontainer:latest
+          docker push git.protron.dev/doc/daddvintagecontaineryproxy:${GITHUB_SHA}