pitrou commented on code in PR #50125:
URL: https://github.com/apache/arrow/pull/50125#discussion_r3386519696


##########
ci/docker/ubuntu-22.04-cpp-minimal.dockerfile:
##########
@@ -15,8 +15,9 @@
 # specific language governing permissions and limitations
 # under the License.
 
-ARG base=amd64/ubuntu:22.04
-FROM ${base}
+ARG arch=amd64
+ARG base=ubuntu:22.04
+FROM --platform=linux/${arch} ${base}

Review Comment:
   Our Ubuntu dockerfiles are also used for CUDA and in that case they a 
different `base`.



##########
ci/docker/ubuntu-22.04-cpp-minimal.dockerfile:
##########
@@ -15,8 +15,9 @@
 # specific language governing permissions and limitations
 # under the License.
 
-ARG base=amd64/ubuntu:22.04
-FROM ${base}
+ARG arch=amd64
+ARG base=ubuntu:22.04
+FROM --platform=linux/${arch} ${base}

Review Comment:
   Our Ubuntu dockerfiles are also used for CUDA and in that case they use a 
different `base`.



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