Made rust version in Dockerfile static, this seems to have really fixed the cache issues
# See https://github.com/LukeMathWalker/cargo-chef
-FROM rust as planner
+ARG RUST_VERSION=1.52.1-buster
+FROM rust:${RUST_VERSION} as planner
WORKDIR /scryer-prolog
RUN cargo install cargo-chef
COPY . .
RUN cargo chef prepare --recipe-path recipe.json
-FROM rust as cacher
+FROM rust:${RUST_VERSION} as cacher
WORKDIR /scryer-prolog
RUN cargo install cargo-chef
COPY --from=planner /scryer-prolog/recipe.json recipe.json
RUN cargo chef cook --release --recipe-path recipe.json
-FROM rust as builder
+FROM rust:${RUST_VERSION} as builder
WORKDIR /scryer-prolog
COPY . .
# Copy over the cached dependencies
