Adds delete-pod functionality

vars/functions.groovy

@@ -1,5 +1,53 @@
 #!groovy
 
+def deletePod(
+    String kubeAuth,
+    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
+spec:
+  containers:
+  - name: alpine
+    imagePullPolicy: Always
+    image: ${repository}/library/alpine:latest
+    tty: true
+    command:
+    - /busybox/sh
+""",
+    ){
+        node(label) {
+            container("alpine") {
+                sh """
+                    apk add --no-cache curl
+                    curl -L --silent https://storage.googleapis.com/kubernetes-release/release/\$(curl -s https://storage.googleapis.com/kubernetes-release/release/stable.txt)/bin/linux/amd64/kubectl -o /usr/local/bin/kubectl
+                    chmod +x /usr/local/bin/kubectl
+                """
+
+                withKubeConfig([
+                    credentialsId: kubeAuth,
+                    serverUrl: kubeURL,
+                    namespace: namespace,
+                ]) {
+                    sh "for i in \$(kubectl get pods --selector ${selector} -o name); do kubectl delete \${i}; done"
+                }
+            }
+        }
+    }
+}
+
 def buildContainer(String repository,
     String imageDest,
     String dockerFile,