CI: added env for dstester version checkout

Signed-off-by: ismail <mohammed.ismail@openairinterface.org>

ci-scripts/Jenkinsfile-Bracket-Test

@@ -40,6 +40,9 @@ def dsT_host = ""
 def dsT_host_user = ""
 def dsT_host_ip_addr = ""
 
+// dsTester tag to use
+def dsTesterTag = params.DSTESTER_TAG
+
 // Flags
 def scmEvent = false
 def upstreamEvent = false
@@ -198,7 +201,7 @@ pipeline {
                 [$class: 'UsernamePasswordMultiBinding', credentialsId: "${params.dsTesterGitLabRepository_Credentials}", usernameVariable: 'git_username', passwordVariable: 'git_token']
               ]) {
                 sh "git clone https://${git_username}:${git_token}@github.com/OPENAIRINTERFACE/chasseur.git . > ../git_clone.log 2>&1"
-                sh "git checkout edge >> ../git_clone.log 2>&1"
+                sh "git checkout -f " + dsTesterTag + " >> ../git_clone.log 2>&1"
                 dir ('jenkins') {
                   try {
                     sh "python3 ./dogmatix-agent.py -f ./suits/dc/nrf-bracket.yaml -d true | tee ../../DS-TEST-RESULTS/dsTester_Summary.txt"