Chown workspace for non-root containers

When running jobs on Kubernetes containers instead of the Jenkins built-in node,
containers running as a non-root user have problems cleaning the workspace.
Run chown on jnlp so the workspace matches runAsUser/runAsGroup before forceCleanupWS.

Signed-off-by: Noam Tsemah <ntsemah@nvidia.com>

Author: ntsemah

src/com/mellanox/cicd/Matrix.groovy

@@ -159,6 +159,18 @@ def forceCleanupWS() {
     }
 }
 
+def chownWorkspace(runAsUser, runAsGroup) {
+    if ("${runAsUser}" != "0" && "${runAsGroup}" != "0") {
+        sh """
+            if [ -n "\${WORKSPACE}" ]; then
+                chown -R ${runAsUser}:${runAsGroup} "\${WORKSPACE}" 2>/dev/null || true
+            fi
+            if [ -e "\${WORKSPACE}@tmp" ]; then
+                chown -R ${runAsUser}:${runAsGroup} "\${WORKSPACE}@tmp" 2>/dev/null || true
+            fi
+        """
+    }
+}
 
 def getArchConf(config, arch) {
 
@@ -939,6 +951,7 @@ spec:
     {
         retry(count: 2, conditions: [kubernetesAgent(), nonresumable()]) {
             node(POD_LABEL) {
+                chownWorkspace(runAsUser, runAsGroup)
                 stage (branchName) {
                     container(cname) {
                         runSteps(image, config, branchName, axis, steps, 'k8')