Add a new Dockerfile for the grammer-check bot

 - Made with ubuntu 16.10 and python3
 - Include antlr-complete.jar
 - Switch to system llvm 3.9

Author: dns2utf8

src/ci/docker/README.md

@@ -0,0 +1,8 @@
+# Testing containers locally
+
+Use the `run.sh` from `src/ci/docker`.
+The `src/ci/run.sh` is used inside the container.
+
+```
+./run.sh x86_64-gnu-grammartest
+```

src/ci/docker/x86_64-gnu-grammartest/Dockerfile

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+FROM ubuntu:16.10
+
+RUN apt-get update && apt-get install -y --no-install-recommends \
+  g++ \
+  make \
+  file \
+  curl \
+  ca-certificates \
+  python \
+  git \
+  cmake \
+  ccache \
+  sudo \
+  gdb \
+  llvm-3.9-tools \
+  libedit-dev \
+  zlib1g-dev \
+  antlr4 \
+  bison \
+  flex \
+  openjdk-8-jdk-headless
+
+RUN cd /usr/local/lib && curl http://www.antlr.org/download/antlr-4.5.3-complete.jar -o antlr-complete.jar
+
+ENV RUST_CONFIGURE_ARGS \
+         --build=x86_64-unknown-linux-gnu \
+         --llvm-root=/usr/lib/llvm-3.9
+ENV RUST_CHECK_TARGET check-grammar
+RUN mkdir /tmp/obj
+RUN chmod 777 /tmp/obj