Add Python-slim Docker image

.dockerignore

@@ -1,9 +1,2 @@
 build
 test
-.git
-girder
-girder_annotation
-large_image
-sources
-utilities
-examples

.github/workflows/docker.yml

@@ -0,0 +1,37 @@
+name: Docker Package
+on:
+  push:
+    tags: "*"
+    branches:
+      - master
+  pull_request:
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
+
+jobs:
+  build-and-publish:
+    runs-on: ubuntu-latest
+    if: github.event_name == 'push' || github.event_name == 'workflow_dispatch' || ( github.event_name == 'pull_request' && github.event.pull_request.head.repo.full_name == github.repository )
+    steps:
+      - uses: actions/checkout@v2
+      - name: Log into the Container registry
+        uses: docker/login-action@v1
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: token
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Extract metadata for the Docker image
+        id: meta
+        uses: docker/metadata-action@v3
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+      - name: Build and push the Docker image
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          file: slim.Dockerfile
+          push: ${{ github.actor != 'dependabot[bot]' }}
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}

slim.Dockerfile

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+# Build wheels
+FROM python:3.9-slim as build
+
+# Need git for setuptools_scm
+RUN apt-get update \
+    && apt-get install -y --no-install-recommends git \
+    && apt-get purge -y --auto-remove \
+    && rm -rf /var/lib/apt/lists/*
+
+COPY . /opt/build-context/
+WORKDIR /opt/build-context
+
+RUN python -m pip install --upgrade pip wheel setuptools
+RUN sh .circleci/make_wheels.sh
+RUN mv ~/wheels /opt/build-context/
+
+# Production
+FROM python:3.9-slim
+
+COPY --from=build /opt/build-context/wheels /opt/wheels
+LABEL maintainer="Kitware, Inc. <[email protected]>"
+LABEL repo="https://github.com/girder/large_image"
+# NOTE: this does not install any girder3 packages
+RUN pip install \
+    --find-links https://girder.github.io/large_image_wheels \
+    --find-links=/opt/wheels \
+    'pylibmc>=1.5.1' \
+    matplotlib \
+    pyvips \
+    simplejpeg \
+    $(ls -1  /opt/wheels/large_image*.whl)