Add issue template for onboarding new machine images

.github/ISSUE_TEMPLATE/add_new_machine_image.md

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+---
+name: Onboard new machine images for latest Kubernetes version
+about: Create an issue to track tasks for onboarding new machine images of latest Kubernetes version 
+title: Onboard new machine images for Kubernetes version v<> 
+
+---
+
+/area provider/ibmcloud
+
+## Tasks
+
+- [ ] Build images using automation in [image-builder](https://github.com/kubernetes-sigs/image-builder) repository
+  - [ ] VPC
+  - [ ] PowerVS
+  - [ ] PowerVS with DHCP support
+
+- Test the images
+  - [ ] VPC
+  - [ ] PowerVS
+  - [ ] PowerVS with DHCP support
+
+- [ ] Update [documentation](https://cluster-api-ibmcloud.sigs.k8s.io/machine-images/)
+
+- [ ] Import the new images to VPC and PowerVS workspaces for CI
+
+- [ ] Update Kubernetes version in E2E [config files](https://github.com/kubernetes-sigs/cluster-api-provider-ibmcloud/tree/main/test/e2e/config)
+
+- [ ] Update [E2E script](https://github.com/kubernetes-sigs/cluster-api-provider-ibmcloud/blob/main/scripts/ci-e2e.sh) with latest image names
+
+
+**Notes**:
+* The format of the new image name should be as follows:
+  * VPC: capibm-vpc-{os-distribution}-
+  {os-version}-kube-v{k8s-version}
+    * ex: capibm-vpc-ubuntu-2404-kube-v1-32-3
+  * PowerVS: capibm-powervs-{os-distribution}-
+  {os-version}-{k8s-version}
+    * ex: capibm-powervs-centos-streams9-1-32-3