Rust worker now rebuilds in ~53s on my machine

rust/worker/.dockerignore

@@ -0,0 +1,3 @@
+.dockerignore
+.gitignore
+Dockerfile

rust/worker/Dockerfile

@@ -1,20 +1,34 @@
 FROM rust:1.74.1 as builder
 ARG CHROMA_KUBERNETES_INTEGRATION=0
-ARG RELEASE_MODE=0
 ENV CHROMA_KUBERNETES_INTEGRATION $CHROMA_KUBERNETES_INTEGRATION
 
+ARG RELEASE_MODE=
+
 WORKDIR /
 RUN git clone https://github.com/chroma-core/hnswlib.git
 
+# Cache dependencies by building them without our code first.
+# https://dev.to/rogertorres/first-steps-with-docker-rust-30oi
+# https://www.reddit.com/r/rust/comments/126xeyx/exploring_the_problem_of_faster_cargo_docker/
 WORKDIR /chroma/
-COPY . .
-
+COPY Cargo.toml Cargo.toml
+COPY Cargo.lock CARGO.lock
+COPY idl/ idl/
+COPY /rust/worker/Cargo.toml rust/worker/Cargo.toml
 ENV PROTOC_ZIP=protoc-25.1-linux-x86_64.zip
 RUN curl -OL https://github.com/protocolbuffers/protobuf/releases/download/v25.1/$PROTOC_ZIP \
     && unzip -o $PROTOC_ZIP -d /usr/local bin/protoc \
     && unzip -o $PROTOC_ZIP -d /usr/local 'include/*' \
     && rm -f $PROTOC_ZIP
+# We need to replace the query node's real main() with a dummy at the expected location.
+RUN mkdir -p rust/worker/src/bin/ && echo "fn main() {}" > rust/worker/src/bin/query_service.rs
 
 RUN if [ "$RELEASE_MODE" = "1" ]; then cargo build --release; else cargo build; fi
+RUN rm -f rust/worker/src/bin/query_service.rs
+
+COPY rust/ rust/
+RUN touch rust/worker/src/bin/query_service.rs
+RUN if [ "$RELEASE_MODE" = "1" ]; then cargo install --path rust/worker; else cargo install --debug --path rust/worker; fi
+COPY rust/worker/chroma_config.yaml .
 
-CMD ["./target/release/query_service"]
+CMD ["query_service"]