fix: backport package-docker-snapshot.sh script (#4424)

script/jenkins/package-docker-snapshot.sh

@@ -0,0 +1,29 @@
+#!/usr/bin/env bash
+#
+# Build the docker image for the apm-server, retag and push it to the given docker registry
+#
+# Arguments:
+# - NEW_TAG, this is the tag for the docker image to be pushed.
+# - NEW_IMAGE, this is the docker image name to be pushed.
+#
+set -euo pipefail
+
+NEW_TAG=${1:?Docker tag is not set}
+NEW_IMAGE=${2:?Docker image is not set}
+
+export PLATFORMS='linux/amd64'
+export TYPE='docker'
+export SNAPSHOT='true'
+export IMAGE="docker.elastic.co/apm/apm-server"
+
+echo 'INFO: Build docker images'
+make release
+
+echo 'INFO: Get the just built docker image'
+TAG=$(docker images ${IMAGE} --format "{{.Tag}}" | head -1)
+
+echo "INFO: Retag docker image (${IMAGE}:${TAG})"
+docker tag "${IMAGE}:${TAG}" "${NEW_IMAGE}:${NEW_TAG}"
+
+echo "INFO: Push docker image (${NEW_IMAGE}:${NEW_TAG})"
+docker push "${NEW_IMAGE}:${NEW_TAG}"