add container build workflow

.github/workflows/build-and-publish.yml

@@ -0,0 +1,50 @@
+name: Build and Publish
+
+on:
+  push:
+    branches:
+      - main
+    tags:
+      - "*"
+  pull_request:
+
+jobs:
+  build-and-publish-docker-image:
+    name: Build docker images and publish
+    runs-on: ubuntu-latest
+
+    steps:
+
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
+      - name: Set up docker buildx
+        uses: docker/setup-buildx-action@v3
+        with:
+          platforms: linux/amd64,linux/arm/v7,linux/arm64
+
+      - name: Login to GitHub Packages
+        uses: docker/login-action@v2
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build omnilock image and publish as specific tag
+        uses: docker/build-push-action@v5
+        if: ${{ github.ref_type == 'tag' }}
+        with:
+          context: ./
+          tags: "ghcr.io/${{ github.repository }}:${{ github.ref_name }}"
+          push: true
+
+      - name: Build omnilock image and publish as latest
+        uses: docker/build-push-action@v4
+        if: ${{ github.ref_type != 'tag' }}
+        with:
+          context: ./
+          tags: "ghcr.io/${{ github.repository }}:latest"
+          push: ${{ github.ref == 'refs/heads/main' }}