Trigger BMO e2e tests through prow

This is to verify that the jenkins operator for prow works as expected.
The idea is to trigger jenkins jobs through prow instead of through the
ghprb jenkins plugin. When we have verified that this works, we can
continue with the rest of the jenkins jobs and remove the ghprb
triggers. Then we can also update the required status checks and make
the prow-jenkins jobs required.

Signed-off-by: Lennart Jern <lennart.jern@est.tech>

jenkins/jobs/bmo_e2e_tests.pipeline

@@ -4,8 +4,10 @@ import java.text.SimpleDateFormat
 def TIMEOUT = 3600
 
 // Set defaults for non-PR jobs
-def branch = env.ghprbActualCommit ?: "main"
-def repoUrl = env.ghprbAuthorRepoGitUrl ?: "https://github.com/metal3-io/baremetal-operator.git"
+def pullSha = (env.PULL_PULL_SHA) ?: (env.ghprbActualCommit) ?: "main"
+def repoUrl = "https://github.com/metal3-io/baremetal-operator.git"
+// Fetch the main branch and the pullSha, nothing else
+def refspec = '+refs/heads/main:refs/remotes/origin/main ' + pullSha
 
 pipeline {
   agent none
@@ -26,11 +28,12 @@ pipeline {
           stage("Checkout source code") {
             steps {
               checkout scmGit(
-                  branches: [[name: branch]],
-                  userRemoteConfigs: [[url: repoUrl, credentialsId: "metal3-jenkins-github-token"]],
+                  branches: [[name: pullSha]],
+                  userRemoteConfigs: [[url: repoUrl, credentialsId: "metal3-jenkins-github-token", refspec: refspec]],
                   extensions: [[$class: "WipeWorkspace"],
                   [$class: "CleanCheckout"],
-                  [$class: "CleanBeforeCheckout"]],
+                  [$class: "CleanBeforeCheckout"],
+                  cloneOption(honorRefspec: true)],
                   submoduleCfg: [],)
               script {
                 CURRENT_START_TIME = System.currentTimeMillis()

prow/manifests/overlays/metal3/config.yaml

@@ -540,6 +540,16 @@ presubmits:
                 value: "/"
             image: ghcr.io/yannh/kubeconform:v0.6.2-alpine@sha256:49b5f6b320d30c1b8b72a7abdf02740ac9dc36a3ba23b934d1c02f7b37e6e740
             imagePullPolicy: Always
+    - name: metal3-bmo-e2e-test-pull
+      # E2e tests do not exist before release-0.5
+      branches:
+        - main
+        - release-0.5
+      agent: jenkins
+      # Don't run unless triggered to avoid wasting resources
+      always_run: false
+      # Until we have checked that it works, keep it optional
+      optional: true
 
   metal3-io/cluster-api-provider-metal3:
     - name: gomod