Update to rust 1.48

Dockerfile

@@ -1,5 +1,33 @@
-FROM rust:1.43-stretch
+# rustlang images no longer support debian:stretch
+FROM buildpack-deps:stretch
 
+# From https://github.com/rust-lang/docker-rust
+ENV RUSTUP_HOME=/usr/local/rustup \
+ CARGO_HOME=/usr/local/cargo \
+ PATH=/usr/local/cargo/bin:$PATH \
+ RUST_VERSION=1.48.0
+
+RUN set -eux; \
+ dpkgArch="$(dpkg --print-architecture)"; \
+ case "${dpkgArch##*-}" in \
+ amd64) rustArch='x86_64-unknown-linux-gnu'; rustupSha256='ee7ade44063c96c6a37012cc599cb560dce95205c86d17b247c726d2285b230c' ;; \
+ armhf) rustArch='armv7-unknown-linux-gnueabihf'; rustupSha256='afab10b89436bfb5ff7db4f4d5ad4d82faee98165915801d73e965e873661b1c' ;; \
+ arm64) rustArch='aarch64-unknown-linux-gnu'; rustupSha256='99f42ab89c790e8825d91c99edee22b0176f68969d42dc27a89a5d9651c3ceba' ;; \
+ i386) rustArch='i686-unknown-linux-gnu'; rustupSha256='6fefdd5c429545b9c710c5492402215e1256cb002f19840db64303281b5ded3c' ;; \
+ *) echo >&2 "unsupported architecture: ${dpkgArch}"; exit 1 ;; \
+ esac; \
+ url="https://static.rust-lang.org/rustup/archive/1.23.0/${rustArch}/rustup-init"; \
+ wget "$url"; \
+ echo "${rustupSha256} *rustup-init" | sha256sum -c -; \
+ chmod +x rustup-init; \
+ ./rustup-init -y --no-modify-path --profile minimal --default-toolchain $RUST_VERSION --default-host ${rustArch}; \
+ rm rustup-init; \
+ chmod -R a+w $RUSTUP_HOME $CARGO_HOME; \
+ rustup --version; \
+ cargo --version; \
+ rustc --version;
+
+# plato-specific
 RUN /usr/bin/dpkg --add-architecture armhf
 RUN apt-get update && apt-get install -y pkg-config \
  gcc-arm-linux-gnueabihf \

Dockerfile.dev

@@ -1,4 +1,4 @@
-FROM rust:1.43-buster
+FROM rust:1.48-buster
 
 RUN apt-get update && apt-get install -y libtool \
  pkg-config \