Add documentation for devcontiner

CONTRIBUTING.md

@@ -81,6 +81,8 @@ Please submit the security issue report [here](https://github.com/vdaas/vald/iss
 
 ## Contributing Source Code
 
+Please refer to our [development documentaion](./docs/contributing/development.md) for information on setting up a development environment.
+
 ### Before contributing source code
 
 Follow these steps to make a contribution to any of our open source repositories:

Makefile

@@ -271,7 +271,7 @@ K8S_SERVER_VERSION ?= $(eval K8S_SERVER_VERSION := $(shell echo "$(K8S_KUBECTL_V
 # values file to use when deploying sample vald cluster with make k8s/vald/deploy
 HELM_VALUES ?= charts/vald/values/dev.yaml
 # extra options to pass to helm when deploying sample vald cluster with make k8s/vald/deploy
-HELM_EXTRA_OPTIONS ?= ""
+HELM_EXTRA_OPTIONS ?=
 
 COMMA := ,
 SHELL = bash

docs/contributing/development.md

@@ -0,0 +1,70 @@
+# Development documentation
+
+This document describes how to set up the development environment and how to develop Vald.
+
+## Set up environment
+
+### Prerequisites
+
+#### OS
+
+- When using Docker related environment, you can use any OS that supports Docker.
+- When using native environment, `Linux` is required.
+
+#### Architecture
+
+`amd64` is recommended because `NGT`, the vector search library we use, is optimized for `amd64`.
+But you can also build and test `Vald` on `arm64` with the same way as described below.
+
+### Devcontainer
+
+This is the easiest way to start developing `Vald`. You can just open our [devcontainer.json](https://github.com/vdaas/vald/blob/main/.devcontainer/devcontainer.json) with `VS Code` and go.
+
+### Other
+
+We don't officially have a setup documentation for now, but you can take a look at the [`Dockerfile`](https://github.com/vdaas/vald/blob/main/dockers/dev/Dockerfile).
+That's everything you need to build and test `Vald`, so you can use it as a reference.
+
+> If you would like to use the `Dockerfile` directlly, please note that `docker-in-docker` environment is required to run our E2E tests.
+> In devcontainer, [`VS Code` handles it for us](https://github.com/devcontainers/features/tree/main/src/docker-in-docker).
+
+## Run tests
+
+### Unit tests
+
+The command below will run all the unit tests.
+
+```bash
+make test
+```
+
+### E2E tests
+
+The steps below will deploy a Vald cluster to the local `k3d` cluster and run the E2E tests.
+
+1. Change `example/helm/values.yaml` to `dimensions: 784` and `distance_type: l2`.
+2. Run the commands below.
+
+```bash
+# Download the dataset
+make hack/benchmark/assets/dataset/fashion-mnist-784-euclidean.hdf5
+
+# Start k3d
+make k3d/start
+
+# Wait for a while until the cluster is ready
+# You might want to use k9s for this
+
+# Deploy Vald
+make k8s/vald/deploy
+
+# Wait for a while until the deployment is ready
+
+# Run E2E tests
+make e2e E2E_WAIT_FOR_CREATE_INDEX_DURATION=3m
+
+# The result will be shown in three minutes or so
+
+# Delete the cluster
+make k8s/vald/delete
+```