docs: Update DEVELOPERS.md (#861)

DEVELOPERS.md

@@ -1,18 +1,53 @@
 # Docs for Developers
 
-The entire monorepo is managed by [moon](https://moonrepo.dev/).
+The entire monorepo is managed by [Earthly](https://earthly.dev).
 And you need [direnv](https://direnv.net/).
 
-## How to install deps
-```shell
-go install github.com/golangci/golangci-lint/cmd/[email protected]
-go install github.com/onsi/ginkgo/v2/[email protected]
-```
-
-
-## Generate SDK with Moon and Speakeasy
+## How to start developing
+To use Earthly and dev environments in Kubernetes, you need the following environment variables (in .direnv/.env):
+Environment variables are split into several pieces:
+- Project config: License of the various tools used in the repository (Not required for local development)
+    - SPEAKEASY_API_KEY: License for [Speakeasy](https://www.speakeasyapi.dev/)
+    - GITHUB_TOKEN: Github token for actions
+    - GORELEASER_KEY: Github token for releases
+- vCluster config:
+    - FORMANCE_DEV_KUBE_TOKEN: Kubernetes token for dev cluster access
+    - FORMANCE_DEV_KUBE_API_SERVER_ADDRESS: dev cluster address
+    - FORMANCE_DEV_TLD: dev domain to access the stack
+    - FORMANCE_DEV_GHCR_REGISTRY: Registry for images
+    - FORMANCE_DEV_USER: Your username
+- Admin config: only for our DNS configuration with Route53
+    - FORMANCE_AWS_KEY_ID: AWS Key ID
+    - FORMANCE_AWS_SECRET_KEY: AWS Secret Key
 
+Once you have configured all the following elements, you can run the following commands to deploy the various components:
+```bash
+earthly -P --push github.com/formancehq/earthly/bootstrap/+deploy-base-component --component traefik
+earthly -P --push github.com/formancehq/earthly/bootstrap/+deploy-base-component --component cert-manager
+earthly -P --push github.com/formancehq/earthly/bootstrap/+deploy-base-component --component postgres
+earthly -P --push github.com/formancehq/earthly/bootstrap/+deploy-base-component --component elasticsearch
+earthly -P --push github.com/formancehq/earthly/bootstrap/+deploy-base-component --component otel-collector
+earthly -P --push github.com/formancehq/earthly/bootstrap/+deploy-base-component --component nats
+earthly -P --push github.com/formancehq/earthly/bootstrap/+deploy-base-component --component jaeger
+earthly -P --push github.com/formancehq/earthly/bootstrap/+deploy-base-component --component goproxy
+earthly -P --push github.com/formancehq/earthly/bootstrap/+deploy-base-component --component ghcr-registry
+earthly -P --push github.com/formancehq/earthly/bootstrap/+deploy-base-component --component buildkitd
 ```
-moon run openapi:build
+You can now start deploying all components.
+```bash
+earthly -P --push +deploy-all
+```
+
+## How to deploy a new version of components
+There are several ways to deploy a component:
+- Deploy all components
+- Deploy a specific component
+### Deploy all components
+```bash
+earthly -P --push +deploy-all
 ```
 
+### Deploy a specific component
+```bash
+earthly -P --push +deploy --component <component_name>
+```