Add a GithubAction CI to build the docker images.

No really useful for now. But will be in next commit.

.github/ci_images/bionic_builder.dockerfile

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+FROM ubuntu:bionic
+
+ENV LANG C.UTF-8
+ENV OS_NAME bionic
+
+RUN apt update -q \
+  && apt install -q -y --no-install-recommends \
+# Base build tools
+    build-essential automake libtool cmake ccache pkg-config autopoint patch \
+    python3-pip python3-setuptools python3-wheel git subversion wget unzip \
+    ninja-build openssh-client \
+# Packaged dependencies
+    libbz2-dev libmagic-dev uuid-dev zlib1g-dev \
+    libmicrohttpd-dev aria2 libgtest-dev \
+# Qt packages
+    libqt5gui5 qtbase5-dev qtwebengine5-dev libqt5svg5-dev qt5-image-formats-plugins qt5-default \
+# To create the appimage of kiwix-desktop
+    libfuse2 fuse patchelf \
+# Flatpak tools
+    elfutils flatpak flatpak-builder \
+# Cross win32 compiler
+    g++-mingw-w64-i686 gcc-mingw-w64-i686 gcc-mingw-w64-base mingw-w64-tools \
+# Other tools (to remove)
+#    vim less grep \
+  && apt-get clean -y \
+  && rm -rf /var/lib/apt/lists/* /usr/share/doc/* /var/cache/debconf/* \
+  && pip3 install meson==0.52.1 pytest gcovr
+
+# Create user
+RUN useradd --create-home runner
+USER runner
+WORKDIR /home/runner
+ENV PATH /home/runner/.local/bin:$PATH

.github/ci_images/f30_builder.dockerfile

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+FROM fedora:30
+
+ENV LANG C.UTF-8
+ENV OS_NAME f30
+
+RUN dnf install -y --nodocs \
+# Base build tools
+    make automake libtool cmake git-core subversion pkg-config gcc-c++ \
+    wget unzip ninja-build ccache which patch gcovr xz openssh-clients \
+# Cross win32 compiler
+    mingw32-gcc-c++ mingw32-bzip2-static mingw32-win-iconv-static \
+    mingw32-winpthreads-static mingw32-zlib-static mingw32-xz-libs-static \
+    mingw32-libmicrohttpd \
+# Other tools (to remove)
+#    vim less grep
+  && dnf remove -y "*-doc" \
+  && dnf autoremove -y \
+  && dnf clean all \
+  && pip3 install meson==0.52.1 pytest
+
+# Create user
+RUN useradd --create-home runner
+USER runner
+WORKDIR /home/runner
+ENV PATH /home/runner/.local/bin:$PATH

.github/ci_images/focal_builder.dockerfile

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+FROM ubuntu:focal
+
+ENV LANG C.UTF-8
+ENV OS_NAME focal
+
+RUN apt update -q \
+  && apt install -q -y --no-install-recommends \
+# Base build tools
+    build-essential automake libtool cmake ccache pkg-config autopoint patch \
+    python3-pip python3-setuptools python3-wheel git subversion wget unzip \
+    ninja-build openssh-client \
+# Packaged dependencies
+    libbz2-dev libmagic-dev uuid-dev zlib1g-dev \
+    libmicrohttpd-dev aria2 libgtest-dev \
+# Qt packages
+    libqt5gui5 qtbase5-dev qtwebengine5-dev libqt5svg5-dev qt5-image-formats-plugins qt5-default \
+# To create the appimage of kiwix-desktop
+    libfuse2 fuse patchelf \
+# Flatpak tools
+    elfutils flatpak flatpak-builder \
+# Cross win32 compiler
+    g++-mingw-w64-i686 gcc-mingw-w64-i686 gcc-mingw-w64-base mingw-w64-tools \
+# Other tools (to remove)
+#    vim less grep \
+  && apt-get clean -y \
+  && rm -rf /var/lib/apt/lists/* /usr/share/doc/* /var/cache/debconf/* \
+  && pip3 install meson==0.52.1 pytest gcovr
+
+# Create user
+RUN useradd --create-home runner
+USER runner
+WORKDIR /home/runner
+ENV PATH /home/runner/.local/bin:$PATH

.github/ci_images/xenial_builder.dockerfile

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+FROM ubuntu:xenial
+
+ENV LANG C.UTF-8
+ENV OS_NAME xenial
+
+RUN apt update -q \
+  && dpkg --add-architecture i386 \
+  && apt install -q -y --no-install-recommends \
+# Base build tools
+    build-essential automake libtool cmake ccache pkg-config autopoint patch \
+    python3-pip python3-setuptools python3-wheel git subversion wget unzip \
+    ninja-build openssh-client \
+# Python (2) is needed to install android-ndk
+    python \
+# Packaged dependencies
+    libbz2-dev libmagic-dev uuid-dev zlib1g-dev default-jdk \
+    libmicrohttpd-dev libgtest-dev \
+# Cross compile i586
+    libc6-dev-i386 lib32stdc++6 gcc-multilib g++-multilib \
+# Other tools (to remove)
+#    vim less grep \
+  && apt-get clean -y \
+  && rm -rf /var/lib/apt/lists/* /usr/share/doc/* /var/cache/debconf/* \
+  && pip3 install meson==0.52.1 pytest gcovr
+
+# Create user
+RUN useradd --create-home runner
+USER runner
+WORKDIR /home/runner
+ENV PATH /home/runner/.local/bin:$PATH

.github/workflows/base.yml

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+name: Build Base
+
+on: [push]
+
+env:
+  DOCKER_VERSION: 25
+
+jobs:
+  Docker:
+    strategy:
+      fail-fast: false
+      matrix:
+        variant: [xenial, bionic, f30, focal]
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: Build docker image
+      shell: bash
+      run: |
+        TAGNAME=${{matrix.variant}}-${DOCKER_VERSION}
+        if [ ! $(curl -sflL https://hub.docker.com/v2/repositories/kiwix/kiwix-build_ci/tags/${TAGNAME}) ]
+        then
+          echo "${{secrets.docker_password}}" | docker login -u "${{secrets.docker_username}}" --password-stdin
+          FULLTAGNAME=kiwix/kiwix-build_ci:${TAGNAME}
+          docker build -t ${FULLTAGNAME} - < ${GITHUB_WORKSPACE}/.github/ci_images/${{matrix.variant}}_builder.dockerfile
+          docker push ${FULLTAGNAME}
+        fi
+