How to customize PARALLEL_BUILDS

[khilman]

I tried the change below, and added a PARALLEL_BUILDS=20 to my .env but it doesn't seem to have any effect on the kernel-build default jobs parameters.

diff --git a/config/jobs.groovy b/config/jobs.groovy
index ac31c2ddc915..d2c5fbaeb0b5 100644
--- a/config/jobs.groovy
+++ b/config/jobs.groovy
@@ -6,6 +6,7 @@ def DOCKER_BASE = System.getenv("DOCKER_BASE")
 def CONFIG_LIST = System.getenv("CONFIG_LIST")
 def KCI_LABS_LIST = System.getenv("KCI_LABS_LIST")
 def KCI_CALLBACK_ID = System.getenv("KCI_CALLBACK_ID")
+def PARALLEL_BUILDS = System.getenv("PARALLEL_BUILDS")
 
 pipelineJob('kernel-tree-monitor') {
   definition {
@@ -111,7 +112,7 @@ pipelineJob('kernel-build') {
     stringParam('KCI_TOKEN_ID', 'api-token', 'Identifier of the KernelCI backend API token stored in Jenkins.')
     stringParam('KCI_CORE_URL', KCI_CORE_URL, 'URL of the kernelci-core repository.')
     stringParam('KCI_CORE_BRANCH', KCI_CORE_BRANCH, 'Name of the branch to use in the kernelci-core repository.')
-    stringParam('PARALLEL_BUILDS', '4', 'Number of kernel builds to run in parallel')
+    stringParam('PARALLEL_BUILDS', PARALLEL_BUILDS, 'Number of kernel builds to run in parallel')
     stringParam('DOCKER_BASE', DOCKER_BASE, 'Dockerhub base address used for the build images.')
   }
 }