🌱 Run prow triggerable basic e2e on project-infra and fix branch issue

jenkins/jobs/prow_integration_tests.pipeline

@@ -11,10 +11,15 @@ KUBECTL_SHA256=(env.KUBECTL_SHA256)
 
 script {
   UPDATED_REPO = "https://github.com/${env.REPO_OWNER}/${env.REPO_NAME}.git"
-  echo "Checkout ${UPDATED_REPO} main"
-  // Set defaults for non-PR jobs
   ci_git_url = "https://github.com/metal3-io/project-infra.git"
-  ci_git_branch = "main"
+
+  if ("${PROJECT_REPO_ORG}" == "metal3-io" && "${PROJECT_REPO_NAME}" == "project-infra") {
+    ci_git_branch = (env.PULL_PULL_SHA) ?: (env.ghprbActualCommit) ?: "main"
+  } else {
+    ci_git_branch = "main"
+  }
+  echo "Checkout ${ci_git_url} branch ${ci_git_branch}"
+
   def date = new Date()
   def dateFormat = new SimpleDateFormat("yyyyMMddHHmmss")
   def rand = new Random()

prow/manifests/overlays/metal3/config.yaml

@@ -1139,7 +1139,7 @@ presubmits:
                 value: "TRUE"
             image: docker.io/golang:1.19
             imagePullPolicy: Always
-    # name: {job_prefix}_{proj}_{capm3_target_branch}_e2e_basic_test_{image_os}
+    # name: {job_prefix}-{proj}-{capm3_target_branch}-e2e-basic-test-{image_os}
     - name: metal3-capm3-main-e2e-basic-test-centos
       branches:
         - main
@@ -1149,6 +1149,16 @@ presubmits:
       always_run: false
       # Until we have checked that it works, keep it optional
       optional: true
+    # name: {job_prefix}-{proj}-{capm3_target_branch}-e2e-basic-test-{image_os}
+    - name: metal3-project_infra-main-e2e-basic-test-centos
+      branches:
+        - main
+        - release-1.6
+      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/community:
     - name: markdownlint