tests: Enable AArch64 Jenkins CI with unit tests for GNU

This commit enables the AArch64 Jenkins CI with build and running
unit tests for GNU toolchain.

Signed-off-by: Henry Wang <Henry.Wang@arm.com>

Jenkinsfile

@@ -67,6 +67,29 @@ pipeline{
 						}
 					}
 				}
+				stage ('AArch64 worker build') {
+					agent { node { label 'bionic-arm64' } }
+					options {
+						timeout(time: 1, unit: 'HOURS')
+					}
+					stages {
+						stage ('Checkout') {
+							steps {
+								checkout scm
+							}
+						}
+						stage ('Build') {
+							steps {
+								sh "scripts/dev_cli.sh build --release"
+							}
+						}
+						stage ('Run unit tests') {
+							steps {
+								sh "scripts/dev_cli.sh tests --unit"
+							}
+						}
+					}
+				}
 				stage ('Worker build (musl)') {
 					agent { node { label 'bionic' } }
 					options {
@@ -108,4 +131,4 @@ def cancelPreviousBuilds() {
 				build.doStop()
 			}
 		}
-}
+}