Add possibility to connect via ssl to broker

[oscgonfer]

This PR adds the possibility to connect via 1883 default port to mqtt broker in lib/task/mqtt-subscriber.rake, or to add an extra env variable in .env that would allow for a ssl connection through another port.

[oscgonfer]

tested with staging api and working OK!

I, [2023-07-06T13:40:22.641275 #1] INFO -- : MQTT TASK STARTING
I, [2023-07-06T13:40:22.641657 #1] INFO -- : clean_session: false
I, [2023-07-06T13:40:22.641688 #1] INFO -- : client_id: ******
I, [2023-07-06T13:40:22.641704 #1] INFO -- : host: ****.smartcitizen.me
I, [2023-07-06T13:40:22.641718 #1] INFO -- : port: ****
I, [2023-07-06T13:40:22.641732 #1] INFO -- : ssl: true
I, [2023-07-06T13:40:22.848133 #1] INFO -- : Connected to ****.smartcitizen.me
I, [2023-07-06T13:40:22.848725 #1] INFO -- : Using clean_session setting: false