Setup automated docker image build + push

.github/workflows/docker-build.yaml

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+name: build
+
+on:
+  push:
+    branches: main
+  pull_request:
+
+jobs:
+  login:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Figure out docker image tag
+        id: taggen
+        uses: docker/metadata-action@v3
+        with:
+          images: |
+            quay.io/yuvipanda/z2jh-hub-with-fancy-profiles
+          tags: |
+            type=sha
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+
+      - name: Login to Quay.io
+        uses: docker/login-action@v1
+        # Run this only on merge
+        if: "${{ github.event_name == 'push' }}"
+        with:
+          registry: quay.io
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_PASSWORD }}
+
+      - name: Build and push
+        id: docker_build
+        uses: docker/build-push-action@v2
+        with:
+          push: "${{ github.event_name == 'push' }}"
+          tags: ${{ steps.taggen.outputs.tags }}
+
+      - name: Image Tag
+        run: echo ${{ steps.taggen.outputs.tags }}

Dockerfile

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+ARG Z2JH_VERSION=3.2.1
+
+# We need node to build the package, but not to run it
+# Use the same base image but with nodejs installed as the builder,
+# then copy over just the built wheel files for the final image.
+# This keeps image size low while also making the whole process
+# reasonably simple
+FROM quay.io/jupyterhub/k8s-hub:${Z2JH_VERSION} as builder
+
+USER root
+
+RUN apt update > /dev/null && \
+    apt install --yes nodejs npm >/dev/null
+
+ADD . /srv/repo
+RUN pip install build
+RUN python -m build /srv/repo --outdir /srv/wheels/
+
+FROM quay.io/jupyterhub/k8s-hub:${Z2JH_VERSION}
+
+USER root
+COPY --from=builder /srv/wheels/*.whl /srv/wheels/
+RUN pip install /srv/wheels/*
+
+USER ${NB_USER}