Support precompiled rust gems out of the box

Author: ianks

Manifest.txt

@@ -228,6 +228,7 @@ bundler/lib/bundler/templates/newgem/ext/newgem/extconf-rust.rb.tt
 bundler/lib/bundler/templates/newgem/ext/newgem/newgem.c.tt
 bundler/lib/bundler/templates/newgem/ext/newgem/newgem.h.tt
 bundler/lib/bundler/templates/newgem/ext/newgem/src/lib.rs.tt
+bundler/lib/bundler/templates/newgem/github/workflows/build-gems.yml.tt
 bundler/lib/bundler/templates/newgem/github/workflows/main.yml.tt
 bundler/lib/bundler/templates/newgem/gitignore.tt
 bundler/lib/bundler/templates/newgem/gitlab-ci.yml.tt

bundler/lib/bundler/cli/gem.rb

@@ -136,6 +136,9 @@ def run
       case config[:ci]
       when "github"
         templates.merge!("github/workflows/main.yml.tt" => ".github/workflows/main.yml")
+        if extension == "rust"
+          templates.merge!("github/workflows/build-gems.yml.tt" => ".github/workflows/build-gems.yml")
+        end
         config[:ci_config_path] = ".github "
       when "gitlab"
         templates.merge!("gitlab-ci.yml.tt" => ".gitlab-ci.yml")
@@ -447,12 +450,5 @@ def rubocop_version
     def standard_version
       "1.3"
     end
-
-    def validate_rust_builder_rubygems_version
-      if Gem::Version.new(rust_builder_required_rubygems_version) > Gem.rubygems_version
-        Bundler.ui.error "Your RubyGems version (#{Gem.rubygems_version}) is too old to build Rust extension. Please update your RubyGems using `gem update --system` or any other way and try again."
-        exit 1
-      end
-    end
   end
 end

bundler/lib/bundler/templates/newgem/github/workflows/build-gems.yml.tt

@@ -0,0 +1,65 @@
+---
+name: Build gems
+
+on:
+  push:
+    tags:
+      - "v*"
+      - "cross-gem/*"
+  workflow_dispatch:
+
+jobs:
+  ci-data:
+    runs-on: ubuntu-latest
+    outputs:
+      result: ${{ steps.fetch.outputs.result }}
+    steps:
+      - uses: oxidize-rb/actions/fetch-ci-data@v1
+        id: fetch
+        with:
+          supported-ruby-platforms: |
+            exclude: ["arm-linux", "x64-mingw32"]
+          stable-ruby-versions: |
+            exclude: ["2.5", "2.6", "2.7", "head"]
+
+  source-gem:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: ruby/setup-ruby@v1
+        with:
+          bundler-cache: true
+
+      - name: Build gem
+        run: bundle exec rake build
+
+      - uses: actions/upload-artifact@v3
+        with:
+          name: source-gem
+          path: pkg/*.gem
+
+  cross-gem:
+    name: Compile native gem for ${{ matrix.platform }}
+    runs-on: ubuntu-latest
+    needs: ci-data
+    strategy:
+      matrix:
+        platform: ${{ fromJSON(needs.ci-data.outputs.result).supported-ruby-platforms }}
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: ruby/setup-ruby@v1
+        with:
+          bundler-cache: true
+
+      - uses: oxidize-rb/actions/cross-gem@v1
+        id: cross-gem
+        with:
+          platform: ${{ matrix.platform }}
+          ruby-versions: ${{ join(fromJSON(needs.ci-data.outputs.result).stable-ruby-versions, ',') }}
+
+      - uses: actions/upload-artifact@v3
+        with:
+          name: cross-gem
+          path: ${{ steps.cross-gem.outputs.gem-path }}