Integrate docker rebuild workflow

.github/workflows/docker.yml

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+name: Rebuild Docker CI images
+
+on:
+  workflow_dispatch:
+  schedule:
+    - cron: "23 5 * * *"  # daily at 5:23
+
+defaults:
+  run:
+    working-directory: scripts/dev/ci/docker/
+
+jobs:
+  docker:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        image:
+          - archlinux-webkit
+          - archlinux-webengine
+          - archlinux-webengine-unstable
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-python@v2
+        with:
+          python-version: '3.x'
+      - run: pip install jinja2
+      - name: Generate Dockerfile
+        run: python3 generate.py ${{ matrix.image }}
+      - uses: docker/setup-buildx-action@v1
+      - uses: docker/login-action@v1
+        with:
+          username: qutebrowser
+          password: ${{ secrets.DOCKER_TOKEN }}
+      - uses: docker/build-push-action@v2
+        with:
+          context: .
+          tags: "qutebrowser/ci:${{ matrix.image }}"
+          push: ${{ github.ref == 'refs/heads/master' }}
+
+  irc:
+    runs-on: ubuntu-latest
+    needs: [docker]
+    if: "always() && github.repository_owner == 'qutebrowser'"
+    steps:
+    - name: Send success IRC notification
+      uses: Gottox/irc-message-action@v1.1
+      if: "needs.docker.result == 'success'"
+      with:
+        server: chat.freenode.net
+        channel: '#qutebrowser-dev'
+        nickname: qutebrowser-bot
+        message: "[${{ github.workflow }}] \u00033Success:\u0003 ${{ github.ref }} https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }} (@${{ github.actor }})"
+    - name: Send non-success IRC notification
+      uses: Gottox/irc-message-action@v1.1
+      if: "needs.docker.result != 'success'"
+      with:
+        server: chat.freenode.net
+        channel: '#qutebrowser-dev'
+        nickname: qutebrowser-bot
+        message: "[${{ github.workflow }}] \u00034FAIL:\u0003 ${{ github.ref }} https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }} (@${{ github.actor }})"

scripts/dev/ci/docker/Dockerfile.j2

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+FROM thecompiler/archlinux
+MAINTAINER Florian Bruhin <me@the-compiler.org>
+
+{% if unstable %}
+RUN sed -i '/^# after the header/a[kde-unstable]\nInclude = /etc/pacman.d/mirrorlist\n\n[testing]\nInclude = /etc/pacman.d/mirrorlist' /etc/pacman.conf
+{% endif %}
+RUN pacman -Suyy --noconfirm \
+    git \
+    python-tox \
+    python-distlib \
+    qt5-base \
+    qt5-declarative \
+    {% if webengine %}qt5-webengine python-pyqtwebengine{% else %}qt5-webkit{% endif %} \
+    python-pyqt5 \
+    xorg-xinit \
+    xorg-server-xvfb \
+    ttf-bitstream-vera \
+    gcc \
+    libyaml \
+    xorg-xdpyinfo
+
+USER user
+WORKDIR /home/user
+
+CMD git clone /outside qutebrowser.git && \
+    cd qutebrowser.git && \
+    tox -e py38

scripts/dev/ci/docker/README.md

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+This directory contains a Dockerfile template for containers used to test
+qutebrowser on CI.
+
+The `generate.py` script uses that template to generate various image
+configuration.
+
+The images are rebuilt via Github Actions in this directory, and qutebrowser
+then downloads them during the CI run. Note that means that it'll take a while
+until builds will use the newer image if you make a change to this directory.

scripts/dev/ci/docker/generate.py

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+import sys
+
+import jinja2
+
+
+def main():
+    with open('Dockerfile.j2') as f:
+        template = jinja2.Template(f.read())
+
+    image = sys.argv[1]
+    config = {
+        'archlinux-webkit': {'webengine': False, 'unstable': False},
+        'archlinux-webengine': {'webengine': True, 'unstable': False},
+        'archlinux-webengine-unstable': {'webengine': True, 'unstable': True},
+    }[image]
+
+    with open('Dockerfile', 'w') as f:
+        f.write(template.render(**config))
+        f.write('\n')
+
+
+if __name__ == '__main__':
+    main()