Add package-publish workflow (#204)

.dockerignore

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+__pycache__
+*.pyc
+.tox
+.coverage
+.coverage.*
+coverage.xml
+.git
+.mypy_cache
+.pytest_cache
+venv

.github/workflows/package-publish.yml

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+name: Package Publish
+
+on:
+  push:
+    # Publish `master` as Docker `latest` image.
+    branches:
+      - master
+      - stable
+
+    # Publish `1.2.3` tags as releases.
+    tags:
+      - "**"
+
+env:
+  IMAGE_NAME: unimport
+
+jobs:
+  push:
+    runs-on: ubuntu-latest
+    permissions:
+      packages: write
+      contents: read
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Build image
+        run:
+          docker build . --file Dockerfile --tag $IMAGE_NAME --label
+          "runnumber=${GITHUB_RUN_ID}"
+
+      - name: Log in to registry
+        # This is where you will update the PAT to GH_TOKEN
+        run:
+          echo "${{ secrets.GH_TOKEN }}" | docker login ghcr.io -u ${{ github.actor }}
+          --password-stdin
+
+      - name: Push image
+        run: |
+          IMAGE_ID=ghcr.io/${{ github.repository_owner }}/$IMAGE_NAME
+
+          # Strip git ref prefix from version
+          VERSION=$(echo "${{ github.ref }}" | sed -e 's,.*/\(.*\),\1,')
+
+          # Use Docker `latest` tag convention
+          [ "$VERSION" == "master" ] && VERSION=latest
+          # [ "$VERSION" == "stable" ] && VERSION=stable
+
+          docker tag $IMAGE_NAME $IMAGE_ID:$VERSION
+          docker push $IMAGE_ID:$VERSION

Dockerfile

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+FROM python:3.9-alpine
+
+COPY . /app
+WORKDIR /app
+
+RUN apk add cargo
+
+RUN pip install --upgrade pip
+RUN pip install .
+
+ENTRYPOINT [ "python", "-m", "unimport" ]