Added buildx support in cico scripts

Signed-off-by: Aditi Jadhav <aditi.jadhav@ibm.com>

cico_build_nightly.sh

@@ -22,5 +22,6 @@ export SCRIPT_DIR
 
 load_jenkins_vars
 install_deps
+check_buildx_support
 set_nightly_tag
 build_and_push

cico_functions.sh

@@ -33,6 +33,30 @@ function load_jenkins_vars() {
   fi
 }
 
+function check_version() {
+  local query=$1
+  local target=$2
+  echo "$target" "$query" | tr ' ' '\n' | sort -V | head -n1 2> /dev/null
+}
+
+function check_buildx_support() {
+  docker_version="$(docker --version | cut -d' ' -f3 | tr -cd '0-9.')"
+  if [[ $(check_version "$docker_version" "19.03") != 19.03 ]]; then
+    echo "CICO: Docker $docker_version greater than or equal to 19.03 is required."
+    exit 1
+  else
+         # Kernel
+         kernel_version="$(uname -r)"
+         if [[ $(check_version "$kernel_version" "4.8") != "4.8" ]]; then
+                 echo "Kernel $kernel_version too old - need >= 4.8." \
+                         " Install a newer kernel."
+                 exit 1
+         else
+                 echo "kernel $kernel_version has binfmt_misc fix-binary (F) support."
+         fi
+  fi
+}
+
 function install_deps() {
   # We need to disable selinux for now, XXX
   /usr/sbin/setenforce 0  || true
@@ -44,6 +68,15 @@ function install_deps() {
     git
 
   service docker start
+
+  #set buildx env
+  export DOCKER_BUILD_KIT=1
+  export DOCKER_CLI_EXPERIMENTAL=enabled  
+
+  #Enable qemu and binfmt support
+  docker run --rm --privileged docker/binfmt:66f9012c56a8316f9244ffd7622d7c21c1f6f28d
+  docker run --rm --privileged multiarch/qemu-user-static:4.2.0-7 --reset -p yes
+
   echo 'CICO: Dependencies installed'
 }
 
@@ -52,12 +85,6 @@ function set_nightly_tag() {
   export TAG="nightly"
 }
 
-function tag_push() {
-  local TARGET=$1
-  docker tag "${IMAGE}" "$TARGET"
-  docker push "$TARGET"
-}
-
 function build_and_push() {
   REGISTRY="quay.io"
   ORGANIZATION="eclipse"
@@ -72,7 +99,11 @@ function build_and_push() {
   fi
 
   # Let's build and push images to 'quay.io'
-  docker build -t ${IMAGE} .
-  tag_push "${REGISTRY}/${ORGANIZATION}/${IMAGE}:${TAG}"
+  # Create a new builder instance using buildx
+  docker buildx create --use --name builder
+  docker buildx inspect --bootstrap
+
+  docker buildx build --platform linux/amd64,linux/s390x -t ${REGISTRY}/${ORGANIZATION}/${IMAGE}:${TAG} --push --progress plain --no-cache .
+
   echo "CICO: '${TAG}' version of image pushed to '${REGISTRY}/${ORGANIZATION}' organization"
 }