Cache Cargo dependencies for Docker build.

Dockerfile

@@ -6,6 +6,9 @@ WORKDIR /home/rust/src
 RUN USER=root cargo new --bin revolt
 WORKDIR /home/rust/src/revolt
 COPY Cargo.toml Cargo.lock ./
+COPY src/bin/dummy.rs ./src/bin/dummy.rs
+RUN cargo build --release --bin dummy
+
 COPY assets/templates ./assets/templates
 COPY src ./src
 RUN cargo build --release

publish.sh

@@ -2,6 +2,6 @@
 # Tip: for subsequent builds, don't update Cargo.toml
 # in order to not download all the crates again.
 # Update Cargo.toml on major release.
-version=0.4.1-alpha.4
+version=0.4.1-alpha.4-patch.0
 docker build -t revoltchat/server:${version} . &&
     docker push revoltchat/server:${version}

src/bin/dummy.rs

@@ -0,0 +1 @@
+fn main() {}