chore(Jenkinsfile) switch to private registry and only build for arm64

- Use private registry: jenkins-infra/helpdesk#4769
- No need to build for `amd64` nowadays (less data to pull/push and less agents to use)

Signed-off-by: Damien Duportal <damien.duportal@gmail.com>

Author: dduportal

.github/workflows/release-drafter.yml

@@ -5,6 +5,8 @@ on:
       - main
   workflow_dispatch:
   release:
+# Only allow 1 release-drafter build at a time to avoid creating multiple "next" releases
+concurrency: "release-drafter"
 jobs:
   update_release_draft:
     runs-on: ubuntu-latest

Jenkinsfile_k8s

@@ -1,3 +1,4 @@
 buildDockerAndPublishImage('mirrorbits', [
-    targetplatforms: 'linux/amd64,linux/arm64',
-    ])
+    publishToPrivateAzureRegistry: true,
+    targetplatforms: 'linux/arm64',
+])