[Enhancement] Add option to specify TLS in headless mode

[rossov]

When running on Linux hardware, e.g. MeshAdv or PiMesh, it would be super helpful to specify TLS option via environment variable in addition to existing ADDRESS and PORT ones.

Otherwise MeshSense is failing with following messages

[iMeshDevice:HttpConnection]    Connect ❌ Connection failed: fetch failed
[meshtastic] Device Status 4
[meshtastic] Device Status 3

Thanks in advance.