📖 Update build guide

docs/BUILD.md

@@ -5,3 +5,98 @@ This document describes how to build and iterate upon the Equinix Metal (formerl
 This is _not_ intended for regular users.
 
 We recommend following the upstream [Developing Cluster API with Tilt](https://cluster-api.sigs.k8s.io/developer/tilt.html) guide for iterative test and development of CAPP.
+
+## Example workflow
+
+1. `git clone kubernetes-sigs/cluster-api-provider-packet`
+
+1. `git clone kubernetes-sigs/cluster-api`
+
+1. Move to the cluster-api-provider-packet directory
+
+    ```sh
+    cd cluster-api-provider-packet
+    ```
+
+1. `git checkout "branch-you're-testing"`
+
+1. Move to the cluster-api directory you checked out earlier:
+
+    ```sh
+    cd ../cluster-api
+    ```
+
+1. Install tilt and kind
+
+    ```sh
+    brew install tilt
+    brew install kind
+    ```
+
+1. Create the tilt-settings.json file in the cluster-api folder.
+
+    ```sh
+    touch cluster-api/tilt-settings.json 
+    ```
+
+1. Copy the following into that file, updating the <> sections with relevant info:
+
+    ```json
+    {
+        "default_registry": "ghcr.io/<your github username>",
+        "provider_repos": ["../cluster-api-provider-packet"],
+        "enable_providers": ["packet","kubeadm-bootstrap","kubeadm-control-plane"],
+        "kustomize_substitutions": {
+            "PACKET_API_KEY": "<API_KEY>",
+            "EXP_CLUSTER_RESOURCE_SET": "true",
+            "EXP_MACHINE_POOL": "true",
+            "CLUSTER_TOPOLOGY": "true"
+        }
+    }
+    ```
+
+1. Create a cluster.
+   1. Change to the directory where you checked out both projects
+
+        ```sh
+        cd ~
+        ```
+
+   1. Run the kind  install for capd script included in the cluster-api repository:
+
+        ```sh
+        cluster-api/hack/kind-install-for-capd.sh
+        ```
+
+   1. Navigate to the cluster-api directory and run:
+
+        ```sh
+        tilt up
+        ```
+
+   1. Get another terminal window
+
+        ```sh
+        cd cluster-api-provider-packet
+        ```
+
+1. You now have a choice:
+
+   * clusterctl
+
+        ```sh
+        clusterctl generate cluster my-cluster --kubernetes-version=1.23.6 --control-plane-machine-count=1 --worker-machine-count=1 --from templates/cluster-template-kube-vip.yaml > test-kube-vip.yaml
+        ```
+
+      1. Set your kubernetes context to the cluster created in kind
+
+            ```sh
+            kubectl apply -f test-kube-vip.yaml
+            ```
+
+   * e2e testing
+      1. Run your e2e tests.
+
+            ```sh
+            make test-e2e-local
+            ```