diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index f3117c39..9c8d5f26 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -35,22 +35,25 @@ jobs:
           - arm-linux
           - aarch64-linux
           - jruby
-        docker-platform:
-          - linux/amd64
-          - linux/arm64
+        docker-platform-cpu:
+          - amd64
+          - arm64
 
     runs-on: ubuntu-latest
     env:
       PLATFORM: ${{ matrix.platform }}
+      DOCKER_BUILD_PLATFORM: linux/${{ matrix.docker-platform-cpu }}
     steps:
       - uses: actions/checkout@v2
 
       - name: Cache Docker layers
-        uses: actions/cache@v2
+        uses: actions/cache@v3
         with:
           path: tmp/build-cache
-          key: ${{ runner.os }}-${{ matrix.platform }}-buildx-${{ github.sha }}
+          key: ${{ runner.os }}-${{ matrix.platform }}-${{ matrix.docker-platform-cpu }}-buildx-${{ github.sha }}
+          # TODO: remove last key
           restore-keys: |
+            ${{ runner.os }}-${{ matrix.platform }}-${{ matrix.docker-platform-cpu }}-buildx
             ${{ runner.os }}-${{ matrix.platform }}-buildx
 
       - uses: ruby/setup-ruby@v1
@@ -62,9 +65,26 @@ jobs:
         uses: docker/setup-qemu-action@v2
 
       - name: Build docker image
+        id: buildx
         run: |
           docker buildx create --driver docker-container --use
-          bundle exec rake build:${PLATFORM} DOCKER_BUILD_PLATFORM="${{ matrix.docker-platform }}" RCD_DOCKER_BUILD="docker buildx build --platform=${{ matrix.docker-platform }} --cache-from=type=local,src=tmp/build-cache --cache-to=type=local,dest=tmp/build-cache-new --load"
+          extra_tag="rcd-${PLATFORM}-${DOCKER_BUILD_PLATFORM}-${{ github.sha }}"
+          docker_build="docker buildx build --platform=$DOCKER_BUILD_PLATFORM --cache-from=type=local,src=tmp/build-cache --cache-to=type=local,dest=tmp/build-cache-new --load -t $extra_tag"
+          bundle exec rake build:${PLATFORM} RCD_DOCKER_BUILD="$docker_build"
+
+          # Save the image if the commit message contains the docker platform name (e.g. "[linux/arm64] ...")
+          if [[ "${{ github.event.head_commit.message }}" == *"[$DOCKER_BUILD_PLATFORM]"* ]]; then
+            echo "::info::Saving docker image $extra_tag"
+            docker save -o "tmp/${extra_tag}.tar" $extra_tag
+            echo "image-tarball: tmp/${extra_tag}.tar" >> $GITHUB_OUTPUT
+          fi
+
+      - name: Upload Docker image tarball
+        if: ${{ steps.buildx.outputs.image-tarball != '' }}
+        uses: actions/upload-artifact@v3
+        with:
+          path: ${{ steps.buildx.outputs.image-tarball }}
+          retention-days: 1
 
       - name: Move build cache and remove outdated layers
         run: |
@@ -83,7 +103,7 @@ jobs:
       - name: Upload binary gem
         uses: actions/upload-artifact@v2
         with:
-          name: gem-${{ matrix.platform }}
+          name: gem-${{ matrix.platform }}-${{ matrix.docker-platform-cpu }}
           path: test/rcd_test/pkg/*-*-*.gem
 
       - if: matrix.platform == 'jruby'
@@ -109,11 +129,11 @@ jobs:
         name: Upload static binary gem
         uses: actions/upload-artifact@v2
         with:
-          name: gem-${{ matrix.platform }}-static
+          name: gem-${{ matrix.platform }}-${{ matrix.docker-platform-cpu }}-static
           path: test/rcd_test/pkg/*-*-*.gem
 
   job_test_native:
-    name: Test (${{matrix.ruby}}, ${{matrix.platform}})
+    name: Test (${{matrix.ruby}}, ${{matrix.platform}}, ${{ matrix.docker-platform-cpu }})
     needs: docker_build
     strategy:
       fail-fast: false
@@ -155,11 +175,11 @@ jobs:
         with:
           ruby-version: ${{ matrix.ruby }}
       - run: ruby --version
-      - name: Download gem-${{matrix.platform}}
+      - name: Download gem-${{ matrix.platform }}-${{ matrix.docker-platform-cpu }}
         uses: actions/download-artifact@v2
         with:
-          name: gem-${{ matrix.platform }}
-      - name: Install gem-${{matrix.platform}}
+          name: gem-${{ matrix.platform }}-${{ matrix.docker-platform-cpu }}
+      - name: Install gem-${{ matrix.platform }}-${{ matrix.docker-platform-cpu }}
         run: gem install --local *.gem --verbose
       - name: Run tests
         run: |
@@ -199,11 +219,11 @@ jobs:
         with:
           ruby-version: ${{ matrix.ruby }}
       - run: ruby --version
-      - name: Download gem-${{matrix.platform}}-static
+      - name: Download gem-${{ matrix.platform }}-${{ matrix.docker-platform-cpu }}-static
         uses: actions/download-artifact@v2
         with:
-          name: gem-${{ matrix.platform }}-static
-      - name: Install gem-${{matrix.platform}}-static
+          name: gem-${{ matrix.platform }}-${{ matrix.docker-platform-cpu }}-static
+      - name: Install gem-${{ matrix.platform }}-${{ matrix.docker-platform-cpu }}-static
         run: gem install --local *.gem --verbose
       - name: Run tests
         run: |
@@ -237,12 +257,13 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
-      - name: Download gem-${{matrix.platform}}
+      - name: Download gem-${{ matrix.platform }}-${{ matrix.docker-platform-cpu }}
         uses: actions/download-artifact@v2
         with:
-          name: gem-${{ matrix.platform }}
+          name: gem-${{ matrix.platform }}-${{ matrix.docker-platform-cpu }}
       - name: Build image and Run tests
         run: |
+          docker buildx create --driver docker-container --use
           docker run --rm --privileged multiarch/qemu-user-static --reset -p yes
-          docker build --rm --build-arg from_image=${{matrix.from_image}} -t ruby-test -f test/env/Dockerfile.${{matrix.dockerfile}} .
-          docker run --rm -t --network=host -v `pwd`:/build ruby-test
+          docker buildx build --platform=$DOCKER_BUILD_PLATFORM --rm --build-arg from_image=${{matrix.from_image}} -t ruby-test -f test/env/Dockerfile.${{matrix.dockerfile}} .
+          docker run --platform=$DOCKER_BUILD_PLATFORM --rm -t --network=host -v `pwd`:/build ruby-test