First implementation

.forgejo/workflows/test.yml

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+on: [push]
+jobs:
+  test:
+    runs-on: docker
+    steps:
+      - uses: https://git.kemitix.net/kemitix/rust@main
+        with:
+          args: test

Dockerfile

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+FROM docker.io/rust:1.78.0-slim-bookworm
+
+# nodejs - runtime used by forgejo/github actions
+# clang-16 & mold - faster linkers for rust
+RUN apt-get update && \
+  apt-get install -y \
+  --no-install-recommends \
+  nodejs=18.19.0+dfsg-618.19.0+dfsg-6deb12u1deb12u1 \
+  clang-16=1:16.0.6-15~deb12u1 \
+  mold=1.10.1+dfsg-1 && \
+  rm -r /var/lib/apt/lists/*
+
+RUN curl -L https://github.com/cargo-bins/cargo-binstall/releases/latest/download/cargo-binstall-x86_64-unknown-linux-musl.tgz -o cargo-binstall.tgz && \
+  tar -xzf cargo-binstall.tgz && \
+  rm cargo-binstall.tgz
+
+# verify that the binaries are installed
+RUN ls -l /usr/local/cargo/bin/
+RUN cargo chef --version && \
+  rustfmt --version && \
+  cargo fmt --version && \
+  cargo clippy --version && \
+  mold --version && \
+  clang-16 --version && \
+  cargo --version && \
+  rustc --version && \
+  rustup --version && \
+  rustup show
+
+COPY entrypoint.sh /
+
+ENTRYPOINT [ "/entrypoint.sh" ]

README.md

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-# docker-builders
+# docker-builder-rust
 
-Builder images for use by forgejo actions.
+Docker image for building Rust projects with Cargo.
+
+## Usage
+
+In a Forgejo action file, e.g. `.forgejo/workflows/test.yml`:
+
+```yml
+on: [push]
+jobs:
+  test:
+    runs-on: docker
+    steps:
+      - uses: https://git.kemitix.net/kemitix/rust@main
+        with:
+          args: test
+      - uses: https://git.kemitix.net/kemitix/rust@main
+        with:
+          args: build
+
+```
+
+## Contents
+
+- nodejs
+- clang-16
+- mold
+- rust
+- cargo
+- cargo-binstall
+
+## Linking
+
+To take advantage of the clang and mold packages, add the following to the `.cargo/config.toml` file in your project.
+
+```toml
+[target.x86_64-unknown-linux-gnu]                                                
+linker = "/usr/bin/clang-16"                                                     
+rustflags = ["-C", "link-arg=--ld-path=/usr/bin/mold"]
+```
+
+## Binary size
+
+To reduce the size of the debug binary, add the following to the `.cargo/config.toml` file in you project.
+
+```toml
+[profile.dev]      
+debug = 0          
+strip = "debuginfo"
+```

entrypoint.sh

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+#!/usr/bin/env bash
+
+set -e
+
+echo cargo $*
+ls -l