THRIFT-4186 Add travis build for Rust
Client: rs
Patch: Allen George <allen.george@gmail.com>

This closes #1260
diff --git a/build/docker/centos/Dockerfile b/build/docker/centos/Dockerfile
index 59bbfd6..1881343 100644
--- a/build/docker/centos/Dockerfile
+++ b/build/docker/centos/Dockerfile
@@ -119,7 +119,11 @@
       mono-core \
       mono-devel \
       mono-web-devel \
-      mono-extras \
+      mono-extras
+
+# Rust
+RUN curl https://sh.rustup.rs -sSf | sh -s -- -y --default-toolchain 1.17.0
+ENV PATH /root/.cargo/bin:$PATH
 
 # MinGW Dependencies
 RUN yum install -y \