Add x86_64-unknown-linux-musl library release

This adds x86_64-unknown-linux-musl as a new supported target for the
pre-built rusty_v8 library releases, which should avoid multiple
downstream consumers having to build this themselves.

This target is useful when trying to build statically-compiled
executables, which seems like a good thing to support for the purpose of
using deno_core as an embedded JavaScript runtime.

Closes denoland#49.

.github/workflows/ci.yml

@@ -1,6 +1,6 @@
 name: ci
 
-on: 
+on:
   push:
     branches: [main]
   pull_request:
@@ -174,6 +174,12 @@ jobs:
       - name: Rustfmt
         run: cargo fmt -- --check
 
+      - name: Build Musl
+        if: matrix.config.target == 'x86_64-unknown-linux-gnu'
+        run: |
+          docker run -v "$PWD":/usr/src/rusty_v8 -w /usr/src/rusty_v8 rust:alpine3.16 tools/musl-build.sh
+          cp target/${{ matrix.config.variant }}/gn_out/obj/librusty_v8.a target/librusty_v8_${{ matrix.config.variant }}_x86_64-unknown-linux-musl.a
+
       - name: Prepare binary publish
         run: cp
           target/${{ matrix.config.target }}/${{ matrix.config.variant }}/gn_out/obj/${{ env.LIB_NAME }}.${{ env.LIB_EXT }}

tools/musl-build.sh

@@ -0,0 +1,32 @@
+#!/bin/sh
+
+apk add git
+apk add gcc
+apk add ninja
+apk add python3
+apk add clang
+apk add g++
+apk add pkgconfig
+apk add glib-dev
+apk add llvm13-dev
+apk add binutils-gold
+ln -s /usr/bin/python3 /usr/bin/python
+
+export V8_FROM_SOURCE=yes
+GN="$(pwd)/gn/out/gn"
+export GN
+export CLANG_BASE_PATH=/usr
+export GN_ARGS='use_custom_libcxx=false use_lld=false v8_enable_backtrace=false v8_enable_debugging_features=false'
+
+# Bulid GN
+if [ ! -d "./gn" ]; then
+    git clone https://gn.googlesource.com/gn
+    (
+        cd gn || exit
+        python3 build/gen.py
+        ninja -C out
+    )
+fi
+
+# Build rusty_v8
+cargo build