ci: Supply platform argument to docker commands.

Later versions of docker require a `--platform` argument when building
and running from a platform-specific image that differs from the host
platform.

ci/test/00_setup_env.sh

@@ -68,3 +68,6 @@ export CI_BASE_PACKAGES=${CI_BASE_PACKAGES:-build-essential pkgconf curl ca-cert
 export GOAL=${GOAL:-install}
 export DIR_QA_ASSETS=${DIR_QA_ASSETS:-${BASE_SCRATCH_DIR}/qa-assets}
 export CI_RETRY_EXE=${CI_RETRY_EXE:-"retry --"}
+
+# The --platform argument used with `docker build` and `docker run`.
+export CI_IMAGE_PLATFORM=${CI_IMAGE_PLATFORM:-"linux"} # Force linux, but use native arch by default

ci/test/00_setup_env_arm.sh

@@ -10,7 +10,8 @@ export HOST=arm-linux-gnueabihf
 export DPKG_ADD_ARCH="armhf"
 export PACKAGES="python3-zmq g++-arm-linux-gnueabihf busybox libc6:armhf libstdc++6:armhf libfontconfig1:armhf libxcb1:armhf"
 export CONTAINER_NAME=ci_arm_linux
-export CI_IMAGE_NAME_TAG="docker.io/arm64v8/debian:bookworm"  # Check that https://packages.debian.org/bookworm/g++-arm-linux-gnueabihf (version 12.2, similar to guix) can cross-compile
+export CI_IMAGE_NAME_TAG="docker.io/debian:bookworm"  # Check that https://packages.debian.org/bookworm/g++-arm-linux-gnueabihf (version 12.2, similar to guix) can cross-compile
+export CI_IMAGE_PLATFORM="linux/arm64"
 export USE_BUSY_BOX=true
 export RUN_UNIT_TESTS=true
 export RUN_FUNCTIONAL_TESTS=false

ci/test/00_setup_env_i686_multiprocess.sh

@@ -8,7 +8,8 @@ export LC_ALL=C.UTF-8
 
 export HOST=i686-pc-linux-gnu
 export CONTAINER_NAME=ci_i686_multiprocess
-export CI_IMAGE_NAME_TAG="docker.io/amd64/ubuntu:24.04"
+export CI_IMAGE_NAME_TAG="docker.io/ubuntu:24.04"
+export CI_IMAGE_PLATFORM="linux/amd64"
 export PACKAGES="llvm clang g++-multilib"
 export DEP_OPTS="DEBUG=1 MULTIPROCESS=1"
 export GOAL="install"

ci/test/00_setup_env_s390x.sh

@@ -9,7 +9,8 @@ export LC_ALL=C.UTF-8
 export HOST=s390x-linux-gnu
 export PACKAGES="python3-zmq"
 export CONTAINER_NAME=ci_s390x
-export CI_IMAGE_NAME_TAG="docker.io/s390x/ubuntu:24.04"
+export CI_IMAGE_NAME_TAG="docker.io/ubuntu:24.04"
+export CI_IMAGE_PLATFORM="linux/s390x"
 export TEST_RUNNER_EXTRA="--exclude rpc_bind,feature_bind_extra"  # Excluded for now, see https://github.com/bitcoin/bitcoin/issues/17765#issuecomment-602068547
 export RUN_FUNCTIONAL_TESTS=true
 export GOAL="install"

ci/test/00_setup_env_win64.sh

@@ -7,7 +7,8 @@
 export LC_ALL=C.UTF-8
 
 export CONTAINER_NAME=ci_win64
-export CI_IMAGE_NAME_TAG="docker.io/amd64/debian:bookworm"  # Check that https://packages.debian.org/bookworm/g++-mingw-w64-x86-64-posix (version 12.2, similar to guix) can cross-compile
+export CI_IMAGE_NAME_TAG="docker.io/debian:bookworm"  # Check that https://packages.debian.org/bookworm/g++-mingw-w64-x86-64-posix (version 12.2, similar to guix) can cross-compile
+export CI_IMAGE_PLATFORM="linux/amd64"
 export HOST=x86_64-w64-mingw32
 export DPKG_ADD_ARCH="i386"
 export PACKAGES="nsis g++-mingw-w64-x86-64-posix wine-binfmt wine64 wine32 file"

ci/test/02_run_container.sh

@@ -14,7 +14,7 @@ if [ -z "$DANGER_RUN_CI_ON_HOST" ]; then
   # Though, exclude those with newlines to avoid parsing problems.
   python3 -c 'import os; [print(f"{key}={value}") for key, value in os.environ.items() if "\n" not in value and "HOME" != key and "PATH" != key and "USER" != key]' | tee "/tmp/env-$USER-$CONTAINER_NAME"
   # System-dependent env vars must be kept as is. So read them from the container.
-  docker run --rm "${CI_IMAGE_NAME_TAG}" bash -c "env | grep --extended-regexp '^(HOME|PATH|USER)='" | tee --append "/tmp/env-$USER-$CONTAINER_NAME"
+  docker run --platform="${CI_IMAGE_PLATFORM}" --rm "${CI_IMAGE_NAME_TAG}" bash -c "env | grep --extended-regexp '^(HOME|PATH|USER)='" | tee --append "/tmp/env-$USER-$CONTAINER_NAME"
 
   # Env vars during the build can not be changed. For example, a modified
   # $MAKEJOBS is ignored in the build process. Use --cpuset-cpus as an
@@ -31,6 +31,7 @@ if [ -z "$DANGER_RUN_CI_ON_HOST" ]; then
       --build-arg "CI_IMAGE_NAME_TAG=${CI_IMAGE_NAME_TAG}" \
       --build-arg "FILE_ENV=${FILE_ENV}" \
       $MAYBE_CPUSET \
+      --platform="${CI_IMAGE_PLATFORM}" \
       --label="${CI_IMAGE_LABEL}" \
       --tag="${CONTAINER_NAME}" \
       "${BASE_READ_ONLY_DIR}"
@@ -100,6 +101,7 @@ if [ -z "$DANGER_RUN_CI_ON_HOST" ]; then
                   --env-file /tmp/env-$USER-$CONTAINER_NAME \
                   --name "$CONTAINER_NAME" \
                   --network ci-ip6net \
+                  --platform="${CI_IMAGE_PLATFORM}" \
                   "$CONTAINER_NAME")
   export CI_CONTAINER_ID
   export CI_EXEC_CMD_PREFIX="docker exec ${CI_CONTAINER_ID}"