Add ARM build pipeline to RAN-Container-Parent and documentation

ci-scripts/Jenkinsfile-GitLab-Container

@@ -145,6 +145,28 @@ pipeline {
             }
           }
         }
+        stage ("Ubuntu-ARM-Image-Builder") {
+          steps {
+            script {
+              triggerSlaveJob ('RAN-Ubuntu-ARM-Image-Builder', 'Ubuntu-ARM-Image-Builder')
+            }
+          }
+          post {
+            always {
+              script {
+                // Using a unique variable name for each test stage to avoid overwriting on a global variable
+                // due to parallel-time concurrency
+                ubuntuArmBuildStatus = finalizeSlaveJob('RAN-Ubuntu-ARM-Image-Builder')
+              }
+            }
+            failure {
+              script {
+                currentBuild.result = 'FAILURE'
+                failingStages += ubuntuArmBuildStatus
+              }
+            }
+          }
+        }
         stage ("RHEL-Cluster-Image-Builder") {
           steps {
             script {

doc/TESTBenches.md

@@ -25,6 +25,7 @@
 | aerial2       | 172.21.16.131   | CI-Aerial2-Usage      | gNB (PNF/Nvidia CUBB + VNF) | Foxconn RU, _Nvidia Aerial SDK integrated_   |
 | cacofonix     | 172.21.16.150   | CI-Cacofonix-Usage    | gNB (n78, FHI7.2)  |                                                       |
 | matix         | 172.21.19.58    | CI-Matix-Usage        | gNB (n77)          | N310                                                  |
+| gracehopper1-oai | --           | Gracehopper1          | build, gNB/Aerial  | _Nvidia Aerial SDK integrated_                        |
 
 Note: The available resources, and their current usage, is indicated here:
 - [Lockable resources of jenkins-oai](https://jenkins-oai.eurecom.fr/lockable-resources/):
@@ -122,6 +123,15 @@ information on how the images are built.
     - target image from `Dockerfile.lteUE.ubuntu22`
     - target image from `Dockerfile.lteRU.ubuntu22`
   - build unit tests from `ci-scripts/docker/Dockerfile.unittest.ubuntu22`, and run them
+- [RAN-Ubuntu-ARM-Image-Builder](https://jenkins-oai.eurecom.fr/job/RAN-Ubuntu-ARM-Image-Builder/)
+  ~BUILD-ONLY ~4G-LTE ~5G-NR
+  - gracehopper1-oai: ARM Ubuntu 22 image build using docker
+  - base image from `Dockerfile.base.ubuntu22`
+  - build image from `Dockerfile.build.ubuntu22`, followed by
+    - target image from `Dockerfile.gNB.ubuntu22`
+    - target image from `Dockerfile.nr-cuup.ubuntu22`
+    - target image from `Dockerfile.nrUE.ubuntu22`
+    - target image from `Dockerfile.gNB.aerial.ubuntu22`
 
 #### Image Test pipelines