[build] CI config

Run it in parallel with the old build system. This will offer
a migration path and make sure we keep everything working at
the cost of running many CI bots. New stuff is prefixed with "next".

Appveyor already got migrated to the next buildsystem.

After merging, we will follow-up removing duplicated core bots.

scripts/ci/Dockerfile

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+FROM ubuntu:disco-20190718
+
+ENV DEBIAN_FRONTEND="noninteractive"
+ENV ANDROID_HOME="/opt/android"
+
+WORKDIR /src
+
+# Use faster mirrors from Finland
+COPY etc/apt/sources.list /etc/apt
+
+RUN set -eu \
+    && apt-get update\
+    && apt-get dist-upgrade -y
+
+# CI requirements
+RUN set -eu && apt-get install -y \
+    ca-certificates \
+    git \
+    gzip \
+    ssh \
+    tar
+
+# Base dependencies
+RUN set -eu && apt-get install -y \
+    ccache \
+    clang-8 \
+    clang-format-8 \
+    clang-tidy-8 \
+    cmake \
+    fonts-noto \
+    g++-8 \
+    libc++-8-dev \
+    libc++abi-8-dev \
+    mesa-common-dev \
+    ninja-build \
+    nodejs \
+    npm \
+    pkg-config \
+    python3-pip \
+    software-properties-common \
+    xvfb
+
+RUN pip3 install cmake_format
+
+# Linux dependencies
+RUN set -eu && apt-get install -y \
+    libcurl4-openssl-dev \
+    libgl1-mesa-dev \
+    libglfw3-dev \
+    libicu-dev \
+    libjpeg-turbo8-dev \
+    libpng-dev \
+    libuv1-dev \
+    zlib1g-dev
+
+# Qt dependencies
+RUN set -eu && apt-get install -y \
+    qdoc-qt5 \
+    qt5-default
+
+# Android dependencies
+RUN set -eu && apt-get install -y \
+    coreutils \
+    curl \
+    openjdk-8-jdk-headless \
+    unzip
+
+# Install old compilers
+RUN set -eu \
+    && apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 1E9377A2BA9EF27F \
+    && add-apt-repository "deb http://ppa.launchpad.net/ubuntu-toolchain-r/test/ubuntu xenial main" \
+    && add-apt-repository "deb http://us.archive.ubuntu.com/ubuntu/ xenial main universe" \
+    && apt-get install -y \
+        g++-4.9 \
+        g++-5
+
+# Install Android NDK
+RUN set -eu \
+    && mkdir -p ${ANDROID_HOME} && cd ${ANDROID_HOME} \
+    && curl -L --retry 3 https://dl.google.com/android/repository/android-ndk-r19-linux-x86_64.zip -o ndk.zip \
+    && (echo "f02ad84cb5b6e1ff3eea9e6168037c823408c8ac  ndk.zip" | sha1sum -c) \
+    && unzip -q ndk.zip && rm ndk.zip && mv android-ndk-r* ndk-bundle
+
+
+RUN set -eu \
+    && cd ${ANDROID_HOME} \
+    && curl -L --retry 3 https://dl.google.com/android/repository/sdk-tools-linux-4333796.zip -o tools.zip \
+    && (echo "92ffee5a1d98d856634e8b71132e8a95d96c83a63fde1099be3d86df3106def9  tools.zip" | sha256sum -c) \
+    && unzip -q tools.zip && rm tools.zip
+
+RUN set -eu \
+    && yes | ${ANDROID_HOME}/tools/bin/sdkmanager \
+        "platform-tools" \
+        "platforms;android-26" \
+        "build-tools;26.0.3" \
+        "platforms;android-27" \
+        "build-tools;27.0.3" \
+        "platforms;android-28" \
+        "build-tools;28.0.3" \
+        "extras;android;m2repository" \
+        "patcher;v4" \
+        "extras;google;m2repository" \
+        "extras;m2repository;com;android;support;constraint;constraint-layout;1.0.2" \
+        "cmake;3.10.2.4988404"
+
+# Configure ccache
+RUN set -eu && /usr/sbin/update-ccache-symlinks
+
+# Cleanup
+RUN set -eu && apt-get clean

scripts/ci/etc/apt/sources.list

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+deb http://fi.archive.ubuntu.com/ubuntu/ disco main restricted
+deb http://fi.archive.ubuntu.com/ubuntu/ disco-updates main restricted
+deb http://fi.archive.ubuntu.com/ubuntu/ disco universe
+deb http://fi.archive.ubuntu.com/ubuntu/ disco-updates universe
+deb http://fi.archive.ubuntu.com/ubuntu/ disco multiverse
+deb http://fi.archive.ubuntu.com/ubuntu/ disco-updates multiverse
+deb http://fi.archive.ubuntu.com/ubuntu/ disco-backports main restricted universe multiverse
+deb http://security.ubuntu.com/ubuntu/ disco-security main restricted
+deb http://security.ubuntu.com/ubuntu/ disco-security universe
+deb http://security.ubuntu.com/ubuntu/ disco-security multiverse