Fix: dependencies compiled with incompatible versions of rustc

Containerfile

@@ -1,5 +1,6 @@
 #syntax=docker/dockerfile-upstream:1.4.0-rc1
-FROM rust:1.65.0-buster as shuttle-build
+ARG RUSTUP_TOOLCHAIN
+FROM rust:${RUSTUP_TOOLCHAIN}-buster as shuttle-build
 RUN apt-get update &&\
     apt-get install -y curl
 # download protoc binary and unzip it in usr/bin
@@ -26,7 +27,8 @@ COPY --from=cache /build .
 ARG folder
 RUN cargo build --bin shuttle-${folder}
 
-FROM rust:1.65.0-buster as shuttle-common
+ARG RUSTUP_TOOLCHAIN
+FROM rust:${RUSTUP_TOOLCHAIN}-buster as shuttle-common
 RUN apt-get update &&\
     apt-get install -y curl
 RUN rustup component add rust-src
@@ -37,4 +39,6 @@ ARG folder
 COPY ${folder}/prepare.sh /prepare.sh
 RUN /prepare.sh
 COPY --from=builder /build/target/debug/shuttle-${folder} /usr/local/bin/service
+ARG RUSTUP_TOOLCHAIN
+ENV RUSTUP_TOOLCHAIN=${RUSTUP_TOOLCHAIN}
 ENTRYPOINT ["/usr/local/bin/service"]

Makefile

@@ -20,6 +20,10 @@ endif
 
 BUILDX_FLAGS=$(BUILDX_OP) $(PLATFORM_FLAGS) $(CACHE_FLAGS)
 
+# the rust version used by our containers, and as an override for our deployers
+# ensuring all user crates are compiled with the same rustc toolchain
+RUSTUP_TOOLCHAIN=1.65.0
+
 TAG?=$(shell git describe --tags)
 BACKEND_TAG?=$(TAG)
 DEPLOYER_TAG?=$(TAG)
@@ -107,6 +111,7 @@ down: docker-compose.rendered.yml
 shuttle-%: ${SRC} Cargo.lock
 	docker buildx build \
 	       --build-arg folder=$(*) \
+		   --build-arg RUSTUP_TOOLCHAIN=$(RUSTUP_TOOLCHAIN) \
 	       --tag $(CONTAINER_REGISTRY)/$(*):$(COMMIT_SHA) \
 	       --tag $(CONTAINER_REGISTRY)/$(*):$(TAG) \
 	       --tag $(CONTAINER_REGISTRY)/$(*):latest \

service/src/loader.rs

@@ -281,7 +281,7 @@ fn check_version(summary: &Summary) -> anyhow::Result<()> {
     {
         shuttle.version_req()
     } else {
-        return Err(anyhow!("this crate does not use the shutte service"));
+        return Err(anyhow!("this crate does not use the shuttle service"));
     };
 
     if version_req.matches(&valid_version) {