Add scalingo deploy instructions

Author: octo-topi

DEPLOY.md

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+# Scalingo
+
+These directives are intended to be used with the [existing NodeJs buildpack](./api/.buildpacks).
+
+## Pre-requisites
+
+You'll need:
+
+- a Scalingo account;
+- a Scalingo CLI.
+
+## Create applications
+
+### API
+
+Create a Scalingo application.
+
+Add a Postgresql and a Redis addon.
+
+Specify the application folder used for deployment: `PROJECT_DIR=api`.
+
+Deploy a first version, which will initialize the database.
+
+### Front-ends
+
+Enable build:  `NPM_CONFIG_PRODUCTION=false`
+Specify the application folder used for deployment: `PROJECT_DIR=mon-pix`
+Build production-like asset:  `BUILD_ENVIRONMENT=production`
+Setup API proxy: `API_HOST=https://<APPLICATION-NAME>.<REGION>.scalingo.io`
+
+### Check connectivity
+
+Create an account on pix-app.
+
+## Bootstrap
+
+### Get administrator privileges
+
+To be able to create campaigns, you'll need to create an organization.
+These can only be created in pix-admin.
+To get access to pix-admin, grant the relevant privileges to an existing user through SQL:
+
+```shell
+scalingo --region <REGION> --app <APPLICATION-NAME> pgsql-console
+```
+
+``` postgres-sql
+SELECT u.id FROM users u WHERE u.email = '<EMAIL>';
+
+INSERT INTO
+"pix-admin-roles" ("userId", "role")
+VALUES
+(<USER_ID>, 'SUPER_ADMIN');
+```
+
+### Plug LCMS preview
+
+Using an admin account previously created on Pix as values, add these environment variables in LCMS :
+
+```dotenv
+# No trailing slash !
+PIX_API_BASEURL=https://<APPLICATION-NAME>.<REGION>.scalingo.io
+PIX_API_USER_EMAIL=<ACCOUNT-EMAIL>
+PIX_API_USER_PASSWORD=<ACCOUNT-PASSWORD>
+```
+
+# Github
+
+## Auto-merge
+
+Add in the repository action secrets:
+
+- a secret named `PIX_SERVICE_ACTIONS_TOKEN`
+- containing a valid GitHub token
+- for a user with repository write access in the repository action secrets
+
+## Configuration file change
+
+Add in the repository action secrets:
+
+- a secret named `SLACK_BOT_TOKEN`
+- containing a valid Slack token
+
+Add in the repository action secrets:
+
+- a secret named `INTEGRATION_ENV_URL`
+- containing a link to the scalingo application