Initial Version for Jekyll/Ruby build

.github/CODEOWNERS

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+* @dfuchss

.github/workflows/build-gitlab-runner-ruby.yml

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+name: Docker Push Gitlab Runner 4 Jekyll
+
+on:
+  schedule:
+    - cron: "0 0 1 * *"
+  workflow_dispatch:
+  push:
+    # Publish `v1.2.3` tags as releases.
+    tags:
+      - v*
+
+env:
+  IMAGE_NAME: gitlab-runner-jekyll
+
+jobs:
+  push:
+    runs-on: ubuntu-latest
+
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Build image
+        run: mkdir build-dir && docker build build-dir --file gitlab-runner-jekyll/Dockerfile --tag $IMAGE_NAME
+
+      - name: Log into registry
+        run: echo "${{ secrets.GITHUB_TOKEN }}" | docker login ghcr.io -u ${{ github.repository_owner }} --password-stdin
+
+      - name: Push image
+        run: |
+          IMAGE_ID=ghcr.io/${{ github.repository_owner }}/$IMAGE_NAME
+
+          # Change all uppercase to lowercase
+          IMAGE_ID=$(echo $IMAGE_ID | tr '[A-Z]' '[a-z]')
+
+          # Strip git ref prefix from version
+          VERSION=$(echo "${{ github.ref }}" | sed -e 's,.*/\(.*\),\1,')
+
+          # Strip "v" prefix from tag name
+          [[ "${{ github.ref }}" == "refs/tags/"* ]] && VERSION=$(echo $VERSION | sed -e 's/^v//')
+
+          # Use Docker `latest` tag convention
+          [ "$VERSION" == "main" ] && VERSION=latest
+
+          echo IMAGE_ID=$IMAGE_ID
+          echo VERSION=$VERSION
+
+          docker tag $IMAGE_NAME $IMAGE_ID:$VERSION
+          docker push $IMAGE_ID:$VERSION
+

README.md

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+# GitLab Runner for Ruby/Jekyll
+
+GitLab Runner for Shell usage + Ruby/Jekyll Support
+
+Instead of using `gitlab/gitlab-runner` simply use `ghcr.io/kit-sdq/gitlab-runner-jekyll`
+
+* Register as Runner in Shell Mode
+* ```docker run -d --name gitlab-runner-shell --restart always -v /srv/gitlab-runner/config:/etc/gitlab-runner ghcr.io/kit-sdq/gitlab-runner-jekyll```
+
+

gitlab-runner-jekyll/Dockerfile

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+ARG RUBY_INSTALLER_VERSION=0.9.3
+ARG RUBY_VERSION=3.2.2
+
+FROM gitlab/gitlab-runner:latest
+
+RUN echo "Installing needed dependencies" \
+  && apt-get update && apt-get install -y --no-install-recommends \
+  locales \
+  imagemagick \
+  build-essential \
+  zlib1g-dev \
+  jupyter-nbconvert \
+  npm \
+  python3-pip && \
+  apt-get clean && rm -rf /var/lib/apt/lists/* /var/cache/apt/archives/*
+
+RUN echo "Fixing locales" \
+  && sed -i -e 's/# en_US.UTF-8 UTF-8/en_US.UTF-8 UTF-8/' /etc/locale.gen \
+  && locale-gen
+
+ENV LC_ALL=en_US.UTF-8
+ENV LANG=en_US.UTF-8
+ENV LANGUAGE=en_US.UTF-8
+ENV JEKYLL_ENV=production
+
+ARG RUBY_INSTALLER_VERSION
+ARG RUBY_VERSION
+# https://github.com/postmodern/ruby-install/releases/download/v$RUBY_INSTALLER_VERSION/ruby-install-$RUBY_INSTALLER_VERSION.tar.gz
+RUN wget -O ruby-install.tar.gz "https://github.com/postmodern/ruby-install/releases/download/v${RUBY_INSTALLER_VERSION}/ruby-install-${RUBY_INSTALLER_VERSION}.tar.gz" && \
+    tar -xzf ruby-install.tar.gz && \
+    cd "ruby-install-${RUBY_INSTALLER_VERSION}/" && \
+    apt-get update && \
+    make install && \
+    ruby-install --system ruby "${RUBY_VERSION}" && \
+    cd .. && \
+    rm -rf ruby-install* && \
+    apt-get clean && rm -rf /var/lib/apt/lists/* /var/cache/apt/archives/*
+
+RUN pip3 install --upgrade jupyter
+RUN npm install -g purgecss