Fix builds that don't include splinterd
Commit added a lib to splinter that causes Docker builds that don't
have splinterd dependencies to fail because of the workspace Cargo.toml.
@@ -58,6 +58,7 @@ WORKDIR /build
RUN USER=root cargo new --bin cli
RUN USER=root cargo new --lib libsplinter
RUN USER=root cargo new --bin splinterd
+RUN cp libsplinter/src/lib.rs splinterd/src/lib.rs
# Create empty Cargo projects for gameroom
RUN USER=root cargo new --bin examples/gameroom/cli
