[DON'T MERGE] debug build time performance

.github/workflows/build.yml

@@ -9,43 +9,43 @@ concurrency:
 
 jobs:
   build:
-    runs-on: ubuntu-latest
     timeout-minutes: 30
     strategy:
       matrix:
         ruby_version:
           - '3.4.1'
           - '3.3.6'
-          - '3.3.5'
-          - '3.3.4'
-          - '3.3.3'
-          - '3.3.2'
-          - '3.3.1'
-          - '3.3.0'
+          # - '3.3.5'
+          # - '3.3.4'
+          # - '3.3.3'
+          # - '3.3.2'
+          # - '3.3.1'
+          # - '3.3.0'
           - '3.2.6'
-          - '3.2.5'
-          - '3.2.4'
-          - '3.2.3'
-          - '3.2.2'
+          # - '3.2.5'
+          # - '3.2.4'
+          # - '3.2.3'
+          # - '3.2.2'
           - '3.1.6'
-          - '3.1.5'
-          - '3.1.4'
+          # - '3.1.5'
+          # - '3.1.4'
+        platform:
+          - { runner: 'linux-arm64-public', image: 'linux/arm64' }
+          - { runner: 'ubuntu-24.04', image: 'linux/amd64' }
 
+    runs-on: ${{ matrix.platform.runner }}
     steps:
       - name: Check out Git repository
         uses: actions/checkout@v4
 
-      - name: Set up QEMU
-        uses: docker/setup-qemu-action@v3
-
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
 
       - name: Build
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: .
-          platforms: linux/arm64,linux/amd64
+          platforms: ${{ matrix.platform.image }}
           push: false
           build-args: |
             RUBY_VERSION=${{ matrix.ruby_version }}

Dockerfile

@@ -2,8 +2,9 @@ ARG RUBY_VERSION=3.2.2
 FROM public.ecr.aws/docker/library/ruby:$RUBY_VERSION-slim
 
 # Update gems and bundler
-RUN gem update --system --no-document && \
-    gem install -N bundler
+RUN gem update --system --no-document
+RUN gem install -N bundler
+
 
 # Install packages needed to build gems and node modules
 RUN --mount=type=cache,id=dev-apt-cache,sharing=locked,target=/var/cache/apt \