Add m1 to release process

This will create a pre-compiled binary for m1 macs and adds
a link to review embark studios CI for verification.

.github/workflows/main.yml

@@ -215,7 +215,10 @@ jobs:
       matrix:
         include:
           - os: ubuntu-latest
+          # defaults to x86_64-apple-darwin
           - os: macos-latest
+          - os: macos-latest
+            target: aarch64-apple-darwin
           - os: windows-2019
           - os: windows-2019
             target: x86_64-pc-windows-gnu
@@ -390,6 +393,9 @@ jobs:
           os: ubuntu-latest
         - build: x86_64-macos
           os: macos-latest
+        - build: aarch64-macos
+          os: macos-latest
+          target: aarch64-apple-darwin
         - build: x86_64-windows
           os: windows-latest
         - build: x86_64-mingw

.github/workflows/release-process.yml

@@ -79,6 +79,9 @@ jobs:
           PRs to the \`main\` branch to update [RELEASES.md] and then backport
           these PRs to the [release branch][branch].
 
+          Maintainers should also review that aarch64-apple-darwin builds
+          are passing via [embark's CI](https://buildkite.com/embark-studios/wasmtime-aarch64-apple-darwin).
+
           Another automated PR will be made in roughly 2 weeks time when for
           the actual release itself.
 

ci/build-tarballs.sh

@@ -52,7 +52,7 @@ elif [ "$platform" = "x86_64-mingw" ]; then
   cp target/x86_64-pc-windows-gnu/release/wasmtime.exe tmp/$bin_pkgname
   cp target/x86_64-pc-windows-gnu/release/{wasmtime.dll,libwasmtime.a,libwasmtime.dll.a} tmp/$api_pkgname/lib
   fmt=zip
-elif [ "$platform" = "x86_64-macos" ]; then
+elif [ "$platform" = "x86_64-macos" ] || [ "$platform" = "aarch64-macos" ]; then
   # Postprocess the macOS dylib a bit to have a more reasonable `LC_ID_DYLIB`
   # directive than the default one that comes out of the linker when typically
   # doing `cargo build`. For more info see #984