Add ppc64le to cross platforms target

debian uses ppc64el
go uses ppc64le
the cross compiler is powerpc64le
Signed-off-by: Frédéric Dalleau <frederic.dalleau@docker.com>

Dockerfile

@@ -97,12 +97,14 @@ ARG DEBIAN_FRONTEND
 RUN dpkg --add-architecture arm64
 RUN dpkg --add-architecture armel
 RUN dpkg --add-architecture armhf
+RUN dpkg --add-architecture ppc64el
 RUN --mount=type=cache,sharing=locked,id=moby-cross-true-aptlib,target=/var/lib/apt \
     --mount=type=cache,sharing=locked,id=moby-cross-true-aptcache,target=/var/cache/apt \
         apt-get update && apt-get install -y --no-install-recommends \
             crossbuild-essential-arm64 \
             crossbuild-essential-armel \
-            crossbuild-essential-armhf
+            crossbuild-essential-armhf \
+            crossbuild-essential-ppc64el
 
 FROM cross-${CROSS} as dev-base
 
@@ -132,7 +134,8 @@ RUN --mount=type=cache,sharing=locked,id=moby-cross-true-aptlib,target=/var/lib/
         apt-get update && apt-get install -y --no-install-recommends \
             libapparmor-dev:arm64 \
             libapparmor-dev:armel \
-            libapparmor-dev:armhf
+            libapparmor-dev:armhf \
+            libapparmor-dev:ppc64el
 
 FROM runtime-dev-cross-${CROSS} AS runtime-dev
 

hack/make/.binary

@@ -65,6 +65,11 @@ hash_files() {
 				export CC="${CC:-x86_64-linux-gnu-gcc}"
 				export CGO_ENABLED=1
 				;;
+			linux/ppc64le)
+				export CC="${CC:-powerpc64le-linux-gnu-gcc}"
+				export CGO_ENABLED=1
+				;;
+
 		esac
 	fi
 

hack/make/cross

@@ -12,7 +12,7 @@ if [ -x "${DEST}/../binary-daemon/dockerd-${VERSION}" ]; then
 	echo "Created symlinks:" "${DEST}/linux/${arch}/"*
 fi
 
-DOCKER_CROSSPLATFORMS=${DOCKER_CROSSPLATFORMS:-"linux/amd64 windows/amd64"}
+DOCKER_CROSSPLATFORMS=${DOCKER_CROSSPLATFORMS:-"linux/amd64 windows/amd64 linux/ppc64le"}
 
 for platform in ${DOCKER_CROSSPLATFORMS}; do
 	(