chore(ci): change image rentention from 4weeks to 3weeks

Signed-off-by: Sagar Arora <sagar.arora@openairinterface.org>

ci-scripts/cls_cluster.py

@@ -315,9 +315,9 @@ class Cluster:
 
 		# delete old images by Sagar Arora <sagar.arora@openairinterface.org>:
 		# 1. retrieve all images and their timestamp
-		# 2. awk retrieves those whose timestamp is older than 4 weeks
+		# 2. awk retrieves those whose timestamp is older than 3 weeks
 		# 3. issue delete command on corresponding istags (the images are dangling and will be cleaned by the registry)
-		delete_cmd = "oc get istag -o go-template --template '{{range .items}}{{.metadata.name}} {{.metadata.creationTimestamp}}{{\"\\n\"}}{{end}}' | awk '$2 <= \"'$(date -d '-4weeks' -Ins --utc | sed 's/+0000/Z/')'\" { print $1 }' | xargs --no-run-if-empty oc delete istag"
+		delete_cmd = "oc get istag -o go-template --template '{{range .items}}{{.metadata.name}} {{.metadata.creationTimestamp}}{{\"\\n\"}}{{end}}' | awk '$2 <= \"'$(date -d '-3weeks' -Ins --utc | sed 's/+0000/Z/')'\" { print $1 }' | xargs --no-run-if-empty oc delete istag"
 		response = self.cmd.run(delete_cmd)
 		logging.debug(f"deleted images:\n{response.stdout}")