Add GitHub Actions workflow for Docker build and push

Author: mrrobot47

.github/workflows/build.yml

@@ -0,0 +1,25 @@
+on:
+  workflow_dispatch:
+  push:
+    tags:
+      - '*'
+
+permissions:
+  contents: read
+  packages: write
+
+jobs:
+    build:
+        runs-on: ubuntu-latest
+        steps:
+        - name: Checkout
+          uses: actions/checkout@v4
+        - name: install docker emulation
+          run: docker run --rm --privileged tonistiigi/binfmt:latest --install amd64,arm64
+        - name: Set up buildx
+          uses: docker/setup-buildx-action@v3
+        - name: Login to ghcr.io
+          run: echo "${{ secrets.GITHUB_TOKEN }}" | docker login ghcr.io -u ${{ github.actor }} --password-stdin
+        - name: Build and push
+          run: |
+            docker buildx build --platform linux/amd64,linux/arm64 -t $(echo 'ghcr.io/${{ github.repository }}:${{ github.ref_name }}' | tr '[:upper:]' '[:lower:]') --push .