generate server config on first run

[CzBiX]

Generate server config on first run, so it's possible to build an image for everyone to use.

[codecov-io]

Current coverage is 91.13%

Merging #91 into master will increase coverage by +0.07% as of d46b1bb

@@            master     #91   diff @@
======================================
  Files          114     114       
  Stmts        10569   10569       
  Branches       367     362     -5
  Methods          0       0       
======================================
+ Hit           9625    9632     +7
+ Partial        257     254     -3
+ Missed         687     683     -4

Review entire Coverage Diff as of d46b1bb

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[v2ray]

Thx