Create Dockerfile

Also adds a Github workflow to publish a Docker image

.github/workflows/build-docker.yml

@@ -0,0 +1,45 @@
+name: Build Docker
+on:
+  push:
+    branches:
+    - main
+  pull_request:
+    branches:
+    - "*"
+jobs:
+  build:
+    name: Build Docker Image
+    runs-on: ubuntu-latest
+    permissions:
+      packages: write
+      contents: read
+    steps:
+    - name: Setup QEMU
+      uses: docker/setup-qemu-action@v2
+      with:
+        platforms: arm64
+    - name: Setup BuildKit
+      uses: docker/setup-buildx-action@v2
+    - name: Authenticate
+      uses: docker/login-action@v2
+      with:
+        registry: ghcr.io
+        username: ${{ github.repository_owner }}
+        password: ${{ secrets.GITHUB_TOKEN }}
+    - name: Extract Metadata
+      id: meta
+      uses: docker/metadata-action@v4
+      with:
+        images: ghcr.io/${{ github.repository }}
+        tags: |
+          type=sha
+          type=raw,value=latest,enable={{is_default_branch}}
+    - name: Build and Push
+      uses: docker/build-push-action@v4
+      with:
+        platforms: ${{ github.event_name != 'pull_request' && 'linux/amd64,linux/arm64' || 'linux/amd64'  }}
+        push: ${{ github.event_name != 'pull_request' }}
+        tags: ${{ steps.meta.outputs.tags }}
+        labels: ${{ steps.meta.outputs.labels }}
+        cache-from: type=gha
+        cache-to: type=gha,mode=max