feat: easy stellio configuration

**/.env

 No newline at end of file

# PLUG TEST Configuration

You can found a docker compose for easy launching of : orion-ld, scorpio and stellio in their respective directory.

you will need to define the following environment variable before launching the docker compose :

- PORT : the port behind which the broker will be deployed

- DB_PORT : the port behind which the database will be deployed

- SUFFIX : an addition to tha name of the container to easily deploy multiple instances.

then you can launch the docker compose 

```

cd plug-test

cd stellio

PORT=8080 DB_PORT=5432 SUFFIX="-1" docker compose -p first_broker  up

```

if you prefer using an .env file or you are a windows user you can use the .example.env file to set the variable instead.

by changing the variables you can easilly launch a second instance of a broker 

```

cd plug-test

cd stellio

PORT=8081 DB_PORT=5433 SUFFIX="-2" docker compose -p second_broker  up

```

 No newline at end of file

# copy me in a .env file to configure the docker compose

DB_PORT=27017

PORT=1026

SUFFIX=-1

 No newline at end of file

# copy me in a .env file to configure the docker compose

DB_PORT=1111

PORT=5432

SUFFIX=-1

 No newline at end of file

# use this file with : docker compose --env-file .env --env-file .context-source.env -p stellio-context-source up

API_GATEWAY_PORT=8090

KAFKA_PORT=29093

POSTGRES_PORT=5433

SEARCH_SERVICE_PORT=8093

SUBSCRIPTION_SERVICE_PORT=8094

# Used by subscription service when searching entities for recurring subscriptions

# (those defined with a timeInterval parameter)

SUBSCRIPTION_ENTITY_SERVICE_URL=http://search-service:8093

# Used as a base URL by subscription service when serving contexts for notifications

SUBSCRIPTION_STELLIO_URL=http://localhost:8090

CONTAINER_NAME_PREFIX=context-source-