docs : methode de build linux musl avec cargo-zigbuild (aarch64 + x86_64) dans RELEASING.md

RELEASING.md

@@ -30,14 +30,20 @@ Cargo.lock, et lancer toute la batterie :
 ### y compris Debian 12 (glibc 2.36) — ne JAMAIS publier un binaire glibc
 ### compilé sur une base récente.
 
-    docker run --rm -v "${PWD}:/work" -w /work -e CARGO_TARGET_DIR=/tmp/target-musl \
-      rust:1.94-alpine sh -c "apk add --no-cache build-base && \
+    # cargo-zigbuild : zig (~50 Mo) fournit le linker croisé pour les DEUX
+    # cibles musl (rust:1.94-alpine n'embarque pas de compilateur croisé
+    # aarch64 : 'aarch64-linux-musl-gcc not found').
+    docker run --rm -v "${PWD}:/work" -w /work -e CARGO_TARGET_DIR=/tmp/am-target \
+      -e CARGO_INCREMENTAL=0 rust:1.94-alpine sh -c "apk add --no-cache build-base zip curl >/dev/null && \
       rustup target add x86_64-unknown-linux-musl aarch64-unknown-linux-musl && \
-      cargo build --release --locked --target x86_64-unknown-linux-musl && \
-      cargo build --release --locked --target aarch64-unknown-linux-musl && \
+      curl -fsSL https://ziglang.org/download/0.14.1/zig-x86_64-linux-0.14.1.tar.xz -o /tmp/zig.tar.xz && \
+      tar -xf /tmp/zig.tar.xz -C /opt && \
+      export PATH=/opt/zig-x86_64-linux-0.14.1:\$PATH && \
+      cargo install cargo-zigbuild --locked && \
+      cargo zigbuild --release --locked --target x86_64-unknown-linux-musl --target aarch64-unknown-linux-musl && \
       mkdir -p dist && \
-      cp /tmp/target-musl/x86_64-unknown-linux-musl/release/am dist/am-linux-x86_64 && \
-      cp /tmp/target-musl/aarch64-unknown-linux-musl/release/am dist/am-linux-aarch64 && \
+      cp /tmp/am-target/x86_64-unknown-linux-musl/release/am dist/am-linux-x86_64 && \
+      cp /tmp/am-target/aarch64-unknown-linux-musl/release/am dist/am-linux-aarch64 && \
       cd dist && tar -czf am-linux-x86_64.tar.gz am-linux-x86_64 && \
       tar -czf am-linux-aarch64.tar.gz am-linux-aarch64"