add commit id to startup log

[GGeorggg]

add logging at startup:

[...]
airnotifier    | MONGO_URL_REGEX: mongodb:\/\/airnotifierxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
airnotifier    | GIT_ID: 654adda78b05c8e0c3387860e39e8481fafa9c91
airnotifier    | MONGO_SERVER: pbipwebdb01.bmb.gv.at
airnotifier    | MONGO_PORT: 27017
[...]

to provide version information