cant use podtemplate in a function

vars/functions.groovy

@@ -1,34 +1,39 @@
 #!groovy
 
-def deletePod(
+def podYaml (Map config) {
-    String kubeAuth,
+    def output = """
-    String kubeURL,
-    String namespace,
-    String selector
-){
-    def label = "kubernetes-${UUID.randomUUID().toString()}"
-    def ws = pwd()
-
-    podTemplate(
-        label: label,
-        name: "pipeline-worker",
-        yaml: """
 ---
 apiVersion: v1
 kind: Pod
 metadata:
-  name: pipeline-worker
+  name: ${config.templateName}
 spec:
   containers:
-  - name: alpine
+"""
+    if (config.kaniko == true) {
+        output += """
+  - name: kaniko
     imagePullPolicy: Always
-    image: ${repository}/library/alpine:latest
+    image: ${config.repo}/library/kaniko:latest
     tty: true
     command:
     - /busybox/sh
-""",
+"""
-    ){
+    }
-        node(label) {
+    if (config.alpine == true) {
+        output += """
+  - name: alpine
+    imagePullPolicy: Always
+    image: ${config.repo}/library/alpine:latest
+    tty: true
+"""
+    }
+
+    return output
+}
+
+def deletePod (Mab config) {
+    def ws = pwd()
     container ("alpine") {
         sh """
             apk add --no-cache curl
@@ -37,60 +42,30 @@ spec:
         """
 
         withKubeConfig ([
-                    credentialsId: kubeAuth,
+            credentialsId: config.kubeAuth,
-                    serverUrl: kubeURL,
+            serverUrl: config.kubeURL,
-                    namespace: namespace,
+            namespace: config.namespace,
         ]) {
-                    sh "for i in \$(kubectl get pods --selector ${selector} -o name); do kubectl delete \${i}; done"
+            sh "for i in \$(kubectl get pods --selector ${config.selector} -o name); do kubectl delete \${i}; done"
-                }
-            }
         }
     }
 }
 
-def buildContainer(String repository,
+def buildContainer (Map config) {
-    String imageDest,
-    String dockerFile,
-    String repoCreds) {
-
-    def label = "kaniko-${UUID.randomUUID().toString()}"
     def ws = pwd()
-
-    podTemplate(
-        label: label,
-        name: "pipeline-worker",
-        yaml: """
----
-apiVersion: v1
-kind: Pod
-metadata:
-  name: pipeline-worker
-spec:
-  containers:
-  - name: kaniko
-    imagePullPolicy: Always
-    image: ${repository}/library/kaniko:latest
-    tty: true
-    command:
-    - /busybox/sh
-""",
-    ){
-        node(label) {
     container("kaniko") {
-                writeFile(file: ws + "/Dockerfile", text: DF)
+        writeFile (file: ws + "/Dockerfile", text: config.dockerFile)
         withCredentials([usernameColonPassword(
-                    credentialsId: repoCreds,
+            credentialsId: config.repoCreds,
             variable: "dCreds",
         )]) {
-                    sh "set +x; printf '{\"auths\":{\"%s\":{\"auth\": \"%s\"}}}' \"${repository}\" \"${dcreds.bytes.encodeBase64().toString()}\" > /kaniko/.docker/config.json"
+            sh "set +x; printf '{\"auths\":{\"%s\":{\"auth\": \"%s\"}}}' \"${config.repository}\" \"${dcreds.bytes.encodeBase64().toString()}\" > /kaniko/.docker/config.json"
         }
         sh """
             /kaniko/executor \\
                 --context "${ws}" \\
                 -f "${ws}/Dockerfile" \\
-                        --destination "${repository}/${imageDest}
+                --destination "${config.imageDest}"
         """
     }
 }
-    }
-}