Add role ARN state

Stores ARN role provided by the user

app/assets/javascripts/create_cluster/eks_cluster/components/service_credentials_form.vue

@@ -28,7 +28,7 @@ export default {
   },
   data() {
     return {
-      roleArn: '',
+      roleArn: this.$store.state.roleArn,
     };
   },
   computed: {

app/assets/javascripts/create_cluster/eks_cluster/index.js

@@ -23,6 +23,7 @@ export default el => {
     createClusterPath,
     signOutPath,
     externalLinkIcon,
+    roleArn,
   } = el.dataset;
 
   return new Vue({
@@ -36,6 +37,7 @@ export default el => {
         createRolePath,
         createClusterPath,
         signOutPath,
+        roleArn,
       },
       awsCredentials: {
         accessKeyId,

app/assets/javascripts/create_cluster/eks_cluster/store/state.js

@@ -12,6 +12,8 @@ export default () => ({
   accountId: '',
   externalId: '',
 
+  roleArn: '',
+
   clusterName: '',
   environmentScope: '*',
   kubernetesVersion,