Add Docker CI

.github/workflows/docker.yml

@@ -0,0 +1,33 @@
+name: Docker
+
+on:
+  workflow_dispatch:
+  push:
+    branches:
+      - main
+
+env:
+  # Required to make some things output color
+  TERM: ansi
+
+jobs:
+  docker:
+    name: docker
+    runs-on: ubuntu-latest
+    steps:
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+      - name: Login to GHCR
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Build and push
+        uses: docker/build-push-action@v5
+        with:
+          push: true
+          platforms: linux/amd64,linux/arm64
+          tags: ghcr.io/${{ github.repository_owner }}/${{ github.event.repository.name }}:next