lts: new downloads area for LTS v2.8

Adding new shell script to use new
"https://downloads.trustedfirmware.org/tf-a-lts-v2.8"
downloads area for LTS v2.8 branch.

Signed-off-by: Lauren Wehrmeister <lauren.wehrmeister@arm.com>
Change-Id: I972568832205f3d0580fac61d305d415d2fb3bf4
diff --git a/utils.sh b/utils.sh
index a7c2a31..b6dda4d 100644
--- a/utils.sh
+++ b/utils.sh
@@ -26,7 +26,11 @@
   if echo "$JENKINS_URL" | grep -q "oss.arm.com"; then
     source "$ci_root/arm-env.sh"
   elif echo "$JENKINS_URL" | grep -q "ci.trustedfirmware.org"; then
-    source "$ci_root/openci-env.sh"
+    if echo "$GERRIT_BRANCH" | grep -q "lts-v2.8"; then
+      source "$ci_root/openci-lts-v2.8-env.sh"
+    else
+      source "$ci_root/openci-env.sh"
+    fi
   elif echo "$JENKINS_URL" | grep -q "ci.staging.trustedfirmware.org"; then
     source "$ci_root/openci-staging-env.sh"
   fi