namespace cache IDs by TARGETARCH

docker-bake.hcl

@@ -9,6 +9,10 @@ target "_common" {
     args = {
         RUBY_VERSION = "3.4.4"
     }
+    platforms = [
+        "linux/amd64",
+        "linux/arm64",
+    ]
 }
 
 target "bookworm" {

dockerfiles/alpine.Dockerfile

@@ -1,5 +1,7 @@
 ARG RUBY_VERSION="3.4.4"
 ARG BASE_REGISTRY="docker.io"
+ARG TARGETARCH
+
 FROM ${BASE_REGISTRY}/ruby:${RUBY_VERSION}-alpine AS base
 
 ENV RACK_ENV="production" \
@@ -11,7 +13,7 @@ ENV RACK_ENV="production" \
 WORKDIR /kubernaut
 
 RUN \
-  --mount=type=cache,id=var-cache-apk,target=/var/cache/apk,sharing=locked \
+  --mount=type=cache,id=var-cache-apk-${TARGETARCH},target=/var/cache/apk,sharing=locked \
   apk update -q; \
   apk add bash jemalloc
 
@@ -23,7 +25,7 @@ RUN \
 FROM base AS build
 
 RUN \
-  --mount=type=cache,id=var-cache-apk,target=/var/cache/apk,sharing=locked \
+  --mount=type=cache,id=var-cache-apk-${TARGETARCH},target=/var/cache/apk,sharing=locked \
   apk update -q; \
   apk add musl-dev gcc make; \
   apk add bash jemalloc
@@ -31,7 +33,7 @@ RUN \
 COPY Gemfile Gemfile.lock ./
 
 RUN \
-  --mount=type=cache,id=usr-local-bundle-ruby-cache,target=${BUNDLE_PATH}/ruby/3.4.0/cache,sharing=locked \
+  --mount=type=cache,id=usr-local-bundle-ruby-cache-${TARGETARCH},target=${BUNDLE_PATH}/ruby/3.4.0/cache,sharing=locked \
   bundle install
 
 COPY . .

dockerfiles/bookworm.Dockerfile

@@ -1,6 +1,8 @@
 ARG RUBY_VERSION="3.4.4"
 ARG BASE_REGISTRY="docker.io"
 ARG DEBIAN_VERSION="bookworm"
+ARG TARGETARCH
+
 FROM ${BASE_REGISTRY}/ruby:${RUBY_VERSION}-slim-${DEBIAN_VERSION} AS base
 
 ENV RACK_ENV="production" \
@@ -14,14 +16,14 @@ WORKDIR /kubernaut
 RUN rm -f /etc/apt/apt.conf.d/docker-clean
 
 RUN \
-  --mount=type=cache,id=var-cache-apt,target=/var/cache/apt,sharing=locked \
-  --mount=type=cache,id=var-lib-apt,target=/var/lib/apt,sharing=locked \
+  --mount=type=cache,id=var-cache-apt-${TARGETARCH},target=/var/cache/apt,sharing=locked \
+  --mount=type=cache,id=var-lib-apt-${TARGETARCH},target=/var/lib/apt,sharing=locked \
   apt-get update -qq; \
   apt-get install --yes --no-install-recommends \
   libjemalloc2
 
 RUN \
-  --mount=type=cache,id=usr-local-bundle-cache,target=${BUNDLE_PATH},sharing=locked \
+  --mount=type=cache,id=usr-local-bundle-cache-${TARGETARCH},target=${BUNDLE_PATH},sharing=locked \
   gem update --system --no-document; \
   gem install -N bundler
 
@@ -30,8 +32,8 @@ ENV DEBIAN_FRONTEND="noninteractive"
 FROM base AS build
 
 RUN \
-  --mount=type=cache,id=var-cache-apt,target=/var/cache/apt,sharing=locked \
-  --mount=type=cache,id=var-lib-apt,target=/var/lib/apt,sharing=locked \
+  --mount=type=cache,id=var-cache-apt-${TARGETARCH},target=/var/cache/apt,sharing=locked \
+  --mount=type=cache,id=var-lib-apt-${TARGETARCH},target=/var/lib/apt,sharing=locked \
   apt-get update -qq; \
   apt-get install --yes --no-install-recommends \
   build-essential
@@ -39,7 +41,7 @@ RUN \
 COPY Gemfile Gemfile.lock ./
 
 RUN \
-  --mount=type=cache,id=usr-local-bundle-ruby-cache,target=${BUNDLE_PATH}/ruby/3.4.0/cache,sharing=locked \
+  --mount=type=cache,id=usr-local-bundle-ruby-cache-${TARGETARCH},target=${BUNDLE_PATH}/ruby/3.4.0/cache,sharing=locked \
   bundle install
 
 COPY . .