install rust and cargo in musl Dockerfile, allthough that's probably not how this is supposed to work...

strfry · strfry · commit 7ca39dfe8a40 · 2018-10-17T08:10:05.000+02:00
diff --git a/ci/docker/x86_64-unknown-linux-musl/Dockerfile b/ci/docker/x86_64-unknown-linux-musl/Dockerfile
@@ -21,6 +21,9 @@ RUN apk update && \
   llvm5-test-utils \
   python2 \
   tar \
-  zlib-dev  
+  zlib-dev \
+  rust \
+  rust-stdlib \
+  cargo
 
 ENV CC_x86_64_unknown_linux_musl=gcc
