dockerised tests

Dockerfile

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+from ubuntu:bionic
+
+# ---------------------------------------------------------------------------- #
+#   (usually) Cached steps
+# ---------------------------------------------------------------------------- #
+
+# Set variables up, FAST_MODE to prevent git and upgrade
+ENV FAST_MODE="true"
+ENV WORKSPACE="$HOME/workspace"
+
+# Install sudo for compatibility, git since it is skipped, make
+# Triple quiet mode (-qq implies -y, pipe to /dev/null)
+RUN apt-get -qq update && \
+    apt-get -qq install sudo git make \
+     < /dev/null > /dev/null
+
+# Create user with sudo priviledge
+ENV USER="test-user"
+RUN useradd --create-home -m $USER && \
+    adduser $USER sudo
+RUN echo "$USER ALL=(ALL) NOPASSWD: ALL" >> /etc/sudoers
+
+# ---------------------------------------------------------------------------- #
+#   Filesystem copy steps
+# ---------------------------------------------------------------------------- #
+
+# Copy dotfiles in
+ADD --chown=test-user . "$WORKSPACE/dotfiles"
+WORKDIR "$WORKSPACE/dotfiles"
+
+# Allow execution
+RUN chmod +x ./bootstrap.sh
+
+# ---------------------------------------------------------------------------- #
+#   Install steps
+# ---------------------------------------------------------------------------- #
+
+# Run installer
+USER test-user
+RUN make install
+
+# ---------------------------------------------------------------------------- #
+#   Test steps
+# ---------------------------------------------------------------------------- #
+
+# Run tests
+RUN make test || true