Add Gitlab CI config and Dockerfile

.dockerignore

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+/build/

.gitlab-ci.yml

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+ image: docker:stable
+
+ variables:
+   # When using dind service we need to instruct docker, to talk with the
+   # daemon started inside of the service. The daemon is available with
+   # a network connection instead of the default /var/run/docker.sock socket.
+   #
+   # The 'docker' hostname is the alias of the service container as described at
+   # https://docs.gitlab.com/ee/ci/docker/using_docker_images.html#accessing-the-services
+   #
+   # Note that if you're using Kubernetes executor, the variable should be set to
+   # tcp://localhost:2375 because of how Kubernetes executor connects services
+   # to the job container
+   DOCKER_HOST: tcp://docker:2375/
+   # When using dind, it's wise to use the overlayfs driver for
+   # improved performance.
+   DOCKER_DRIVER: overlay2
+
+ services:
+   - docker:dind
+
+ before_script:
+   - docker info
+
+ build:
+   stage: build
+   script:
+     - docker build -t avr-rust .
+     - docker run avr-rust echo hello world

Dockerfile

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+FROM ubuntu:18.04
+
+USER root
+
+# Install dependencies.
+RUN apt-get update && apt-get install -y build-essential cmake curl git python
+
+# Create a regular user.
+RUN useradd -m rustacean
+
+# Copy the code over, create an empty directory for builds.
+ADD . /code
+# RUN cd /code
+RUN mkdir /build && cd /build
+
+# symlink Rust build directory to the /build volume
+# RUN mkdir /build && ln -sf /build /code/build
+
+# Compile rust.
+# RUN /code/x.py build
+
+# Generate Makefile using settings suitable for an experimental compiler
+RUN /code/configure \
+    --enable-debug \
+    --disable-docs \
+    --enable-llvm-assertions \
+    --enable-debug-assertions \
+    --enable-optimize \
+    --enable-llvm-release-debuginfo \
+    --experimental-targets=AVR
+
+RUN make
+RUN make install
+
+# Drop down to the regular user
+USER rustacean
+
+VOLUME /code
+VOLUME /build