build: update zig installation method — heartwood

This simplifies the Dockerfile a little , as the zig package (0.12.0) is available on alpine 3.20 https://repology.org/project/zig/versions

parent image is also updated to current rust-toolchain

Signed-off-by: Yorgos Saslis yorgos.work@proton.me

 # Builds release binaries for Radicle.
 FROM rust:1.77.2-alpine3.19 as builder
 FROM rust:1.80-alpine3.20 as builder
 LABEL maintainer="Radicle Team <team@radicle.xyz>"
 WORKDIR /src
 COPY . .

 # Copy cargo configuration we're going to use to specify compiler options.
 RUN mkdir -p .cargo && cp build/config.toml .cargo/config.toml
 # Install dependencies.
 RUN apk update && apk add --no-cache git musl-dev minisign curl xz asciidoctor
 RUN apk update && apk add --no-cache git musl-dev xz asciidoctor zig
 # Build man pages and strip metadata. Removes all comments, since they include
 # non-reproducible information, such as version numbers.
 RUN asciidoctor --doctype manpage --backend manpage --destination-dir . *.1.adoc && \

 # We use Zig as the linker to perform the compilation from a Linux host.
 # Zig is not yet available on Debian, so we download the official binary.
 # Compilation is done via `cargo-zigbuild` which is a wrapper around `zig`.
 RUN curl -sSf -o zig.tar.xz         https://ziglang.org/download/0.12.0/zig-linux-x86_64-0.12.0.tar.xz && \
     curl -sSf -o zig.tar.xz.minisig https://ziglang.org/download/0.12.0/zig-linux-x86_64-0.12.0.tar.xz.minisig && \
     minisign -Vm zig.tar.xz -P RWSGOq2NVecA2UPNdBUZykf1CCb147pkmdtYxgb3Ti+JO/wCYvhbAb/U && \
     xz -d -c zig.tar.xz | tar -x && \
     mv zig-linux-x86_64-0.12.0/zig /usr/bin/zig && \
     mv zig-linux-x86_64-0.12.0/lib /usr/lib/zig && \
     cargo install cargo-zigbuild@0.18.3
 RUN cargo install cargo-zigbuild@0.19.3
 # Parts of the macOS SDK are required to build Radicle, we make these available

 # Now copy the files to a new image without all the intermediary artifacts to
 # save some space.
 FROM alpine:3.19 as packager
 FROM alpine:3.20 as packager
 ARG RADICLE_VERSION
 ARG SOURCE_DATE_EPOCH