adds read secret command

vars/declarativeFunctions.groovy

@@ -47,6 +47,34 @@ def createSecret (Map config) {
     }
 }
 
+def readSecret (Map config) {
+    def ws = pwd()
+    sh """
+        if [ ! -f "/usr/bin/curl" ] || [ ! -x "/usr/bin/curl" ]; then
+            apk add --no-cache curl
+        fi
+        if [ ! -f "/usr/local/bin/kubectl" ] || [ ! -x "/usr/local/bin/kubectl" ]; then
+            curl -L --silent https://nexus.c.test-chamber-13.lan/repository/google-k8s/\$(curl -s https://nexus.c.test-chamber-13.lan/repository/google-k8s/stable.txt)/bin/linux/amd64/kubectl -o /usr/local/bin/kubectl
+            chmod +x /usr/local/bin/kubectl
+        fi
+    """
+
+    withKubeConfig ([
+        credentialsId: config.kubeAuth,
+        serverUrl: config.kubeURL,
+        namespace: config.namespace
+    ]) {
+        def output = sh(
+            returnStdout: true,
+            script: """#Read Secret
+                set +x
+                kubectl get secret "${config.secretName}" -o jsonpath={".data.${configSecretID}"} | base64 -d
+            """
+        )
+        return output
+    }
+}
+
 def buildContainer (Map config, List buildArg = []) {
     def ws = pwd()
     writeFile (file: ws + "/Dockerfile", text: config.dockerFile)