added a workflow to build and push CI runner docker image (#28539)

.github/workflows/publish-ci-docker-image.yml

@@ -0,0 +1,20 @@
+name: Push CI Runner Docker Image
+
+on: workflow_dispatch
+jobs:
+  push:
+    runs-on: ubuntu-20.04
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Build and Push docker image
+        env:
+          DOCKERHUB_PASSWORD: ${{ secrets.DOCKERHUB_PASSWORD }}
+          DOCKERHUB_USERNAME: ${{ secrets.DOCKERHUB_USERNAME }}
+        run : |
+          docker build -f .ci/Dockerfile
+          docker tag openedx/edx-platform-ci-runner
+          make docker_auth
+          docker push 'openedx/edx-platform-ci-runner:latest'

scripts/ci-runner.Dockerfile

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+FROM summerwind/actions-runner:v2.278.0-ubuntu-20.04 as base
+
+USER root
+
+# Install system requirements
+RUN apt-get update && \
+    # Global requirements
+    DEBIAN_FRONTEND=noninteractive apt-get install --yes \
+    build-essential git language-pack-en libmysqlclient-dev libssl-dev libxml2-dev \
+    libxmlsec1-dev libxslt1-dev \
+    # lynx: Required by https://github.com/edx/edx-platform/blob/b489a4ecb122/openedx/core/lib/html_to_text.py#L16
+    lynx xvfb pkg-config \
+    python3-dev python3-venv \
+    mongodb\
+    && rm -rf /var/lib/apt/lists/*
+
+RUN locale-gen en_US.UTF-8
+ENV LANG en_US.UTF-8
+ENV LANGUAGE en_US:en
+ENV LC_ALL en_US.UTF-8
+
+WORKDIR /edx/app/edxapp/edx-platform
+
+ENV PATH /edx/app/edxapp/nodeenv/bin:${PATH}
+ENV PATH ./node_modules/.bin:${PATH}
+ENV CONFIG_ROOT /edx/etc/
+ENV PATH /edx/app/edxapp/edx-platform/bin:${PATH}
+ENV SETTINGS production
+RUN mkdir -p /edx/etc/
+
+ENV VIRTUAL_ENV=/edx/app/edxapp/venvs/edxapp
+RUN python3.8 -m venv $VIRTUAL_ENV
+ENV PATH="$VIRTUAL_ENV/bin:$PATH"
+
+
+FROM base as build
+
+# Install Python requirements
+COPY setup.py setup.py
+COPY common/lib/ common/lib/
+COPY openedx/core/lib openedx/core/lib
+COPY lms lms
+COPY cms cms
+COPY requirements/pip.txt requirements/pip.txt
+COPY requirements/edx/testing.txt requirements/edx/testing.txt
+COPY requirements/edx/django.txt requirements/edx/django.txt
+RUN pip install -r requirements/pip.txt && \
+pip install -r requirements/edx/testing.txt -r requirements/edx/django.txt
+
+FROM base as runner
+
+COPY --from=build /edx/app/edxapp/venvs/edxapp /edx/app/edxapp/venvs/edxapp
+
+USER runner
+
+CMD ["/entrypoint.sh"]