Migrate to GitHub Container registry

.github/workflows/build.yml

@@ -0,0 +1,18 @@
+name: Build
+on:
+  push:
+    branches: 'main'
+
+jobs:
+  build:
+    name: GitHub Container Registry
+    runs-on: ubuntu-latest
+    needs: [prepare-data]
+    steps:
+    - uses: actions/checkout@v2
+    - name: Login to GitHub Container Registry
+      run: echo ${{ secrets.PAT }} | docker login ghcr.io -u luketainton --password-stdin
+    - name: Build image for GitHub Container Registry
+      run: docker build . --file Dockerfile --tag ghcr.io/luketainton/documize:latest
+    - name: Push image to GitHub Container Registry
+      run: docker push ghcr.io/luketainton/documize:latest

Dockerfile

@@ -1,5 +1,6 @@
 FROM alpine:latest
 LABEL maintainer="Luke Tainton <luke@tainton.uk>"
+LABEL org.opencontainers.image.source="https://github.com/luketainton/documize-docker"
 ARG DOCUMIZE_VERSION=v3.6.0
 RUN apk add --no-cache curl
 WORKDIR /opt