bci2: Allow jobs to choose if they run on an RPi

Jobs that need to compile code, as opposed to simply installing
prebuilt packages and/or copying in files, probably do not want to run
on a Raspberry Pi.  To allow such jobs to opt out of running on a Pi and
wait for the Cluster Autoscaler to bring up an aarch64 node in AWS, the
`buildContainerImage2` function now takes an optional `pi` argument.
The argument defaults to `true`, so existing jobs that expect to run on
a Pi will continue to do so.

resources/podTemplate2.yaml

@@ -17,7 +17,3 @@ spec:
       limits:
         github.com/fuse: 1
   hostUsers: false
-  tolerations:
-  - key: du5t1n.me/machine
-    value: raspberrypi
-    effect: NoExecute

vars/buildContainerImage2.groovy

@@ -8,6 +8,7 @@ def call(args) {
     def archlist = args?.archlist
     def schedule = args?.schedule
     def defaultBranch = args?.defaultBranch
+    def pi = args?.pi
 
     properties([
         pipelineTriggers([cron(schedule ?: 'H H H * *')])
@@ -31,6 +32,9 @@ def call(args) {
     if (defaultBranch == null) {
         defaultBranch = 'main'
     }
+    if (pi == null) {
+        pi = true
+    }
     def repo = "${registry}/${project}/${name}"
     def full_name = "${repo}:${tag}"
 
@@ -44,13 +48,14 @@ def call(args) {
                     full_name: full_name,
                     registry: registry,
                     arch: arch,
+                    pi: pi,
                 )
             }
         }
     }
     parallel stages
 
-    runInPod {
+    runInPod(pi: false) {
         container('buildah') {
             withBuildahCreds(registry) {
                 if (archlist.size() > 1) {
@@ -91,8 +96,9 @@ def buildStage(args) {
     def full_name = args.full_name
     def registry = args.registry
     def arch = args.arch
+    def pi = args.pi
 
-    runInPod(arch) {
+    runInPod(arch: arch, pi: pi) {
         checkout scm
 
         container('buildah') {
@@ -105,14 +111,25 @@ def buildStage(args) {
     }
 }
 
-def runInPod(... args) {
-    def arch = null
-    def block = args.last()
-    if (args.size() > 1) {
-        arch = args[0]
+def runInPod(args, block) {
+    def arch = args?.arch
+    def pi = args?.pi
+    if (pi == null) {
+        pi = true
     }
 
     def podTemplateYaml = libraryResource('podTemplate2.yaml')
+    if (pi) {
+        def tmpl = readYaml(text: podTemplateYaml)
+        def tolerations = tmpl['spec']['tolerations'] ?: []
+        tolerations.push([
+            key: 'du5t1n.me/machine',
+            value: 'raspberrypi',
+            effect: 'NoExecute',
+        ])
+        tmpl['spec']['tolerations'] = tolerations
+        podTemplateYaml = writeYaml(data: tmpl, returnText: true)
+    }
     podTemplate(
         yaml: podTemplateYaml,
         nodeSelector: arch ? "kubernetes.io/arch=${arch}" : null,