[SPARK-31778][K8S][BUILD] Support cross-building docker images

### What changes were proposed in this pull request?

Add cross build support to our docker image script using the new dockerx extension.

### Why are the changes needed?

We have a CI for Spark on ARM, we should support building images for ARM and AMD64.

### Does this PR introduce _any_ user-facing change?

Yes, a new flag is added to the docker image build script to cross-build

### How was this patch tested?
Manually ran build script & pushed to https://hub.docker.com/repository/registry-1.docker.io/holdenk/spark/tags?page=1 verified amd64 & arm64 listed.

Closes #28615 from holdenk/cross-build.

Lead-authored-by: Holden Karau <hkarau@apple.com>
Co-authored-by: Holden Karau <holden@pigscanfly.ca>
Signed-off-by: Holden Karau <hkarau@apple.com>

bin/docker-image-tool.sh

@@ -19,6 +19,8 @@
 # This script builds and pushes docker images when run from a release of Spark
 # with Kubernetes support.
 
+set -x
+
 function error {
   echo "$@" 1>&2
   exit 1
@@ -172,6 +174,7 @@ function build {
   local BASEDOCKERFILE=${BASEDOCKERFILE:-"kubernetes/dockerfiles/spark/Dockerfile"}
   local PYDOCKERFILE=${PYDOCKERFILE:-false}
   local RDOCKERFILE=${RDOCKERFILE:-false}
+  local ARCHS=${ARCHS:-"--platform linux/amd64,linux/arm64"}
 
   (cd $(img_ctx_dir base) && docker build $NOCACHEARG "${BUILD_ARGS[@]}" \
     -t $(image_ref spark) \
@@ -179,6 +182,11 @@ function build {
   if [ $? -ne 0 ]; then
     error "Failed to build Spark JVM Docker image, please refer to Docker build output for details."
   fi
+  if [ "${CROSS_BUILD}" != "false" ]; then
+  (cd $(img_ctx_dir base) && docker buildx build $ARCHS $NOCACHEARG "${BUILD_ARGS[@]}" \
+    -t $(image_ref spark) \
+    -f "$BASEDOCKERFILE" .)
+  fi
 
   if [ "${PYDOCKERFILE}" != "false" ]; then
     (cd $(img_ctx_dir pyspark) && docker build $NOCACHEARG "${BINDING_BUILD_ARGS[@]}" \
@@ -187,6 +195,11 @@ function build {
       if [ $? -ne 0 ]; then
         error "Failed to build PySpark Docker image, please refer to Docker build output for details."
       fi
+      if [ "${CROSS_BUILD}" != "false" ]; then
+        (cd $(img_ctx_dir pyspark) && docker buildx build $ARCHS $NOCACHEARG "${BINDING_BUILD_ARGS[@]}" \
+          -t $(image_ref spark-py) \
+          -f "$PYDOCKERFILE" .)
+      fi
   fi
 
   if [ "${RDOCKERFILE}" != "false" ]; then
@@ -196,6 +209,11 @@ function build {
     if [ $? -ne 0 ]; then
       error "Failed to build SparkR Docker image, please refer to Docker build output for details."
     fi
+    if [ "${CROSS_BUILD}" != "false" ]; then
+      (cd $(img_ctx_dir sparkr) && docker buildx build $ARCHS $NOCACHEARG "${BINDING_BUILD_ARGS[@]}" \
+        -t $(image_ref spark-r) \
+        -f "$RDOCKERFILE" .)
+    fi
   fi
 }
 
@@ -227,6 +245,8 @@ Options:
   -n                    Build docker image with --no-cache
   -u uid                UID to use in the USER directive to set the user the main Spark process runs as inside the
                         resulting container
+  -X                    Use docker buildx to cross build. Automatically pushes.
+                        See https://docs.docker.com/buildx/working-with-buildx/ for steps to setup buildx.
   -b arg                Build arg to build or push the image. For multiple build args, this option needs to
                         be used separately for each build arg.
 
@@ -252,6 +272,12 @@ Examples:
   - Build and push JDK11-based image with tag "v3.0.0" to docker.io/myrepo
     $0 -r docker.io/myrepo -t v3.0.0 -b java_image_tag=11-jre-slim build
     $0 -r docker.io/myrepo -t v3.0.0 push
+
+  - Build and push JDK11-based image for multiple archs to docker.io/myrepo
+    $0 -r docker.io/myrepo -t v3.0.0 -X -b java_image_tag=11-jre-slim build
+    # Note: buildx, which does cross building, needs to do the push during build
+    # So there is no seperate push step with -X
+
 EOF
 }
 
@@ -268,7 +294,8 @@ RDOCKERFILE=
 NOCACHEARG=
 BUILD_PARAMS=
 SPARK_UID=
-while getopts f:p:R:mr:t:nb:u: option
+CROSS_BUILD="false"
+while getopts f:p:R:mr:t:Xnb:u: option
 do
  case "${option}"
  in
@@ -279,6 +306,7 @@ do
  t) TAG=${OPTARG};;
  n) NOCACHEARG="--no-cache";;
  b) BUILD_PARAMS=${BUILD_PARAMS}" --build-arg "${OPTARG};;
+ X) CROSS_BUILD=1;;
  m)
    if ! which minikube 1>/dev/null; then
      error "Cannot find minikube."