ngnix-flask-mysql: when reading password secret file, should strip after read

[Lou King]

Suggest adding .strip() after .read() at

awesome-compose/nginx-flask-mysql/backend/hello.py

Line 11 in e6b1d27

 password=pf.read(), 

I spent days debugging a secrets file which had an errant LF character at the end.

See also https://stackoverflow.com/a/75488788/799921