diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 08679e7..df2e4a9 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -14,28 +14,24 @@ jobs:
 
     strategy:
       matrix:
-        flavor: [focal, bionic]
+        distro: [focal, bionic]
+        arch: [x86_64]
 
     env:
-      FLAVOR: ${{ matrix.flavor }} # build target, name required by binary-builder
+      DISTRO: ${{ matrix.distro }} # build target, name required by binary-builder
+      ARCH: ${{ matrix.arch }} # build target, name required by binary-builder
 
     steps:
       - uses: actions/checkout@v2.3.4
 
-      - name: docker-config
-        uses: renovatebot/internal-tools@v1.5.0
-        with:
-          command: docker-config
-
       - name: binary-builder
-        uses: renovatebot/internal-tools@v1.5.0
+        uses: renovatebot/internal-tools@v1.5.2
         with:
           command: binary-builder
           dry-run: ${{github.ref != 'refs/heads/main'}}
-          build-args: FLAVOR
           token: ${{ secrets.GITHUB_TOKEN }}
 
       - uses: actions/upload-artifact@v2.2.2
         with:
-          name: ${{ env.FLAVOR }}
+          name: ${{ env.DISTRO }}
           path: .cache/*.tar.xz
diff --git a/Dockerfile b/Dockerfile
index 677280f..6cea4da 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,7 +1,7 @@
 #--------------------------------------
 # Ubuntu flavor
 #--------------------------------------
-ARG FLAVOR
+ARG DISTRO
 
 #--------------------------------------
 # base images
@@ -13,7 +13,7 @@ FROM ubuntu:focal@sha256:b4f9e18267eb98998f6130342baacaeb9553f136142d40959a1b46d
 #--------------------------------------
 # builder images
 #--------------------------------------
-FROM build-${FLAVOR} as builder
+FROM build-${DISTRO} as builder
 
 
 ENTRYPOINT [ "dumb-init", "--", "builder.sh" ]
diff --git a/README.md b/README.md
index 8d00e75..5aad32f 100644
--- a/README.md
+++ b/README.md
@@ -11,7 +11,7 @@ Prebuild Ruby releases used by [containerbase/buildpack](https://github.com/cont
 Build the image
 
 ```bash
-docker build -t builder --build-arg APT_PROXY=http://apt-proxy:3142 .
+docker build -t builder --build-arg APT_PROXY=http://apt-proxy:3142 --build-arg DISTRO=focal .
 ```
 
 Test the image
@@ -24,5 +24,8 @@ docker run --rm -it -v ${PWD}/.cache:/cache -e DEBURG=true builder 3.0.0
 
 Optional environment variables
 
-- `APT_PROXY`: Set an APT http proxy for installing build deps
-- `DEBUG`: Show verbose php build output
+| Name        | Description                                                   | Default   |
+| ----------- | ------------------------------------------------------------- | --------- |
+| `DISTRO`    | Set an ubuntu base distro, `focal` and `bionic` are supported | `focal`   |
+| `APT_PROXY` | Set an APT http proxy for installing build deps               | `<empty>` |
+| `DEBUG`     | Show verbose php build output                                 | `<empty>` |
diff --git a/bin/builder.sh b/bin/builder.sh
index 88e24cc..1daed77 100755
--- a/bin/builder.sh
+++ b/bin/builder.sh
@@ -7,6 +7,7 @@ VERSION=${1}
 CODENAME=$(. /etc/os-release && echo ${VERSION_CODENAME})
 
 NAME=ruby
+ARCH=$(uname -p)
 BUILD_ARGS=
 
 if [[ "${DEBUG}" == "true" ]]; then
@@ -18,5 +19,5 @@ ruby-build ${BUILD_ARGS} ${VERSION} /usr/local/${NAME}/${VERSION}
 
 /usr/local/${NAME}/${VERSION}/bin/ruby -v
 
-echo "Compressing ${NAME} ${VERSION} for ${CODENAME}"
-tar -cJf /cache/${NAME}-${VERSION}-${CODENAME}.tar.xz -C /usr/local/${NAME} ${VERSION}
+echo "Compressing ${NAME} ${VERSION} for ${CODENAME}-${ARCH}"
+tar -cJf /cache/${NAME}-${VERSION}-${CODENAME}-${ARCH}.tar.xz -C /usr/local/${NAME} ${VERSION}
diff --git a/bin/install-builder.sh b/bin/install-builder.sh
index 68d00c7..002afee 100755
--- a/bin/install-builder.sh
+++ b/bin/install-builder.sh
@@ -30,6 +30,9 @@ PREFIX=/usr/local ./ruby-build/install.sh
 
 mkdir -p /usr/local/ruby /cache
 
+#--------------------------------
+# cleanup
+#--------------------------------
 if [[ ! -z "${APT_PROXY+x}" ]]; then
   rm -f /etc/apt/apt.conf.d/99buildpack-proxy.conf
 fi