fix static server build script

.travis.yml

@@ -7,7 +7,7 @@ install:
 - docker pull ekidd/rust-musl-builder:latest
 script:
 - cargo build
-- "./build_static.sh server"
+- "./build_static.sh"
 env:
   global:
   - COMMIT=${TRAVIS_COMMIT::8}

Dockerfile.build

@@ -0,0 +1,10 @@
+FROM ekidd/rust-musl-builder AS build
+
+RUN sudo apt-get update && sudo apt-get install -y xorg-dev python3
+
+# We need to add the source code to the image because `rust-musl-builder`
+# assumes a UID of 1000, but TravisCI has switched to 2000.
+ADD . ./
+RUN sudo chown -R rust:rust .
+
+CMD cargo build --release --bin server