Add back GitHub files

.github-archive/.github/workflows/build.yml

@@ -1,17 +0,0 @@
-name: Build
-on:
-  push:
-    branches: 'main'
-
-jobs:
-  build:
-    name: GitHub Container Registry
-    runs-on: ubuntu-latest
-    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