Reduce image size (#76)

* Reduce image size

* Fix run.sh

`+nightly` is actually not compatible with a pinned version of nightly.
But since our way of installing rust set the pinned nightly toolchain
as default anyway, we don't need it anymore.

* try debian ?

* Try debian-slim

Author: senekor

Dockerfile

@@ -1,5 +1,5 @@
 # always build this using the latest stable release
-FROM rust:1.70.0 as build
+FROM rust:1.71.0 as build
 
 
 ARG JQ_VERSION=1.6
@@ -34,8 +34,60 @@ COPY local-registry/* ./
 RUN ${wd}/bin/generate-registry.sh
 
 # As of Dec 2019, we need to use the nightly toolchain to get JSON test output
-FROM rust:1.70.0 AS test
-RUN rustup toolchain add nightly
+# tracking issue: https://github.com/rust-lang/rust/issues/49359
+
+# Official docker images with pinned nightly versions are not provided, but we
+# want to pin the nightly version to avoid unnecessary cache misses. To achieve
+# this, we copy the source of the official rust docker images and replace the
+# version tag with a nightly one, pinned to a specific date.
+
+# official Dockerfile source: 
+# https://github.com/rust-lang/docker-rust/blob/master/1.71.0/bookworm/slim/Dockerfile
+
+################ start-copy-pasta ################
+
+FROM debian:bookworm-slim
+
+ENV RUSTUP_HOME=/usr/local/rustup \
+    CARGO_HOME=/usr/local/cargo \
+    PATH=/usr/local/cargo/bin:$PATH \
+    RUST_VERSION=nightly-2023-07-18
+#                ~~~~~~~~^~~~~~~~~~
+#                 pin version here
+
+RUN set -eux; \
+    apt-get update; \
+    apt-get install -y --no-install-recommends \
+        ca-certificates \
+        gcc \
+        libc6-dev \
+        wget \
+        ; \
+    dpkgArch="$(dpkg --print-architecture)"; \
+    case "${dpkgArch##*-}" in \
+        amd64) rustArch='x86_64-unknown-linux-gnu'; rustupSha256='0b2f6c8f85a3d02fde2efc0ced4657869d73fccfce59defb4e8d29233116e6db' ;; \
+        armhf) rustArch='armv7-unknown-linux-gnueabihf'; rustupSha256='f21c44b01678c645d8fbba1e55e4180a01ac5af2d38bcbd14aa665e0d96ed69a' ;; \
+        arm64) rustArch='aarch64-unknown-linux-gnu'; rustupSha256='673e336c81c65e6b16dcdede33f4cc9ed0f08bde1dbe7a935f113605292dc800' ;; \
+        i386) rustArch='i686-unknown-linux-gnu'; rustupSha256='e7b0f47557c1afcd86939b118cbcf7fb95a5d1d917bdd355157b63ca00fc4333' ;; \
+        *) echo >&2 "unsupported architecture: ${dpkgArch}"; exit 1 ;; \
+    esac; \
+    url="https://static.rust-lang.org/rustup/archive/1.26.0/${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; \
+    apt-get remove -y --auto-remove \
+        wget \
+        ; \
+    rm -rf /var/lib/apt/lists/*;
+
+################ end-copy-pasta ################
+
 ENV wd /opt/test-runner
 RUN mkdir -p ${wd}/bin
 WORKDIR ${wd}

bin/run.sh

@@ -39,7 +39,7 @@ if jq --exit-status '.custom?."test-in-release-mode"?' "$solution_path"/.meta/co
     release="--release"
 fi
 
-timeout -v 15s cargo +nightly test \
+timeout -v 15s cargo test \
     --offline \
     $release \
     -- \