ci: Begin Jenkins build pipeline

Specifying these compute resources to ensure builds to not run on
Raspberry Pi nodes, but instead trigger the autoscaler to launch an EC2
instance to run them.

ci/Jenkinsfile

@@ -0,0 +1,10 @@
+@Library('containerimages')_
+buildContainerImage2(
+    project: 'packages',
+    archlist: ['amd64', 'arm64'],
+    defaultBranch: 'master',
+    resources: [
+      cpu: 4,
+      memory: '2Gi',
+    ],
+)