Adding a script to build m2e project

A script to build m2e project locally

utils/build_m2e-core.sh

+#!/bin/bash
+
+### Firstly please beaware of having the right mvn version
+### mvn minimum version 3.8.6 
+### Already cloned repo m2e-core as well as recommended to have a PR already pushed
+### TIPs: 
+### 1. undoing all changes applied for this script. Please execute: mvn clean && git checkout master && git reset --hard origin/master
+### 2. Ubuntu to configure mvn 3.8.6, 
+### 	sudo update-alternatives --install /usr/bin/mvn mvn /opt/maven/apache-maven-3.8.6/bin/mvn 120
+###		sudo update-alternatives --config mvn
+
+get_pr_id(){
+	local PR_ARG=$1
+	OIFS=$IFS
+	IFS='/'
+	ARR_PR_ARG_TMP=(${PR_ARG})
+	IFS='-'
+	ARR_PR_ARG=(${ARR_PR_ARG_TMP})
+	echo ${ARR_PR_ARG[1]}
+
+}
+
+
+main(){
+
+
+	export GIT_MERGE_AUTOEDIT=no
+	PULL_ID=$1
+
+	### Checking PR-ID format, for instance PR-1361 with ID 1361 (where SBOM was added)
+	re="[0-9]{1,}"
+	[[ ! $PULL_ID =~ $re ]] && echo "ERROR!!! wrong PULL REQUEST ID format: ${PULL_ID}. Only numbers are allowed" && return 1
+
+	### Checking PWD is a m2e-core repo
+	result=$(git remote -v 2>/dev/null)
+	re_repo=m2e-core
+	[[ ! $result =~  $re_repo ]] && echo "ERROR!!! current PWD: ${PWD} is not repo: ${re_repo}" && return 1 
+
+	### Fetching master and PULL_ID
+	git fetch --no-tags --force --progress -- https://github.com/eclipse-m2e/m2e-core.git +refs/pull/${PULL_ID}/head:refs/remotes/origin/PR-${PULL_ID} +refs/heads/master:refs/remotes/origin/master
+	
+	### Loading trusted files from base branch master at ca3fbcd35e40eb7feabdddec81120f06f8bb734c
+	git merge ca3fbcd35e40eb7feabdddec81120f06f8bb734c
+	COMMIT_SHA=$(git rev-parse HEAD^{commit})
+	git checkout -f ${COMMIT_SHA}
+	
+	### Updating submodule
+	git submodule update --init --recursive --remote
+
+	### Building locally
+	mvn clean verify -Dtycho.p2.baselineMode=failCommon --batch-mode -Pits
+	
+	
+	unset GIT_MERGE_AUTOEDIT
+}
+
+main "$@"