chore: improve the automation for the stack version bump (#1351)

* feat: automated update Beats' base version

* chore: reduce number of version occurrences in tests

* chore: decouple unit tests from the current version

* feat: update Jenkinsfile

* feat: automate .stack-version

* fix: append snapshot

* chore: simplify finding single files

There is only one file to modify

(cherry picked from commit 395bdb2)

# Conflicts:
#	.ci/bump-stack-version.sh
#	internal/_testresources/gcp/commits.json
#	internal/_testresources/gcp/snapshots.json
#	internal/utils/utils_test.go

.ci/bump-stack-version.sh

@@ -0,0 +1,65 @@
+#!/usr/bin/env bash
+#
+# Given the stack version this script will bump the version.
+#
+# This script is executed by the automation we are putting in place
+# and it requires the git add/commit commands.
+#
+# Parameters:
+#	$1 -> the version to be bumped. Mandatory.
+#	$2 -> whether to create a branch where to commit the changes to.
+#		  this is required when reusing an existing Pull Request.
+#		  Optional. Default true.
+#
+set -euo pipefail
+MSG="parameter missing."
+VERSION=${1:?$MSG}
+CREATE_BRANCH=${2:-true}
+
+OS=$(uname -s| tr '[:upper:]' '[:lower:]')
+
+if [ "${OS}" == "darwin" ] ; then
+	SED="sed -i .bck"
+else
+	SED="sed -i"
+fi
+
+echo "Update stack with version ${VERSION} in .stack-version"
+echo "${VERSION}-SNAPSHOT" > .stack-version
+git add .stack-version
+
+echo "Update stack with version ${VERSION} in Go files"
+FILE="./internal/common/defaults.go"
+${SED} -E -e "s#(var BeatVersionBase = (\"))[0-9]+\.[0-9]+\.[0-9]+(-[a-f0-9]{8})?#\1${VERSION}#g" $FILE
+git add $FILE
+
+echo "Update stack with version ${VERSION} in Jenkinsfile"
+FILE="./.ci/Jenkinsfile"
+${SED} -E -e "s#(name: 'BEAT_VERSION', defaultValue: ')[0-9]+\.[0-9]+\.[0-9]+(-[a-f0-9]{8})?#\1${VERSION}#g" $FILE
+${SED} -E -e "s#(name: 'STACK_VERSION', defaultValue: ')[0-9]+\.[0-9]+\.[0-9]+(-[a-f0-9]{8})?#\1${VERSION}#g" $FILE
+git add $FILE
+
+echo "Update stack with version ${VERSION} in docker-compose.yml"
+find . -name 'docker-compose.yml' -path './cli/config/compose/profiles/*' -print0 |
+	while IFS= read -r -d '' FILE ; do
+		${SED} -E -e "s#(image: (\")?docker\.elastic\.co/.*):-[0-9]+\.[0-9]+\.[0-9]+(-[a-f0-9]{8})?#\1:-${VERSION}#g" $FILE
+		git add $FILE
+	done
+
+echo "Update stack with version ${VERSION} in deployment.yaml"
+find . -name 'deployment.yaml' -print0 |
+	while IFS= read -r -d '' FILE ; do
+		${SED} -E -e "s#(image: docker\.elastic\.co/.*):[0-9]+\.[0-9]+\.[0-9]+(-[a-f0-9]{8})?#\1:${VERSION}#g" $FILE
+		git add $FILE
+	done
+
+echo "Commit changes"
+if [ "$CREATE_BRANCH" = "true" ]; then
+	git checkout -b "update-stack-version-$(date "+%Y%m%d%H%M%S")"
+else
+	echo "Branch creation disabled."
+fi
+git diff --staged --quiet || git commit -m "bump stack version ${VERSION}"
+git --no-pager log -1
+
+echo "You can now push and create a Pull Request"