regtest: adding aperture docker instance

[hieblmi]

New loop features like instant loop-out and static loop-in depend on aperture.
This PR adds a aperture docker instance to allow the loop client to acquire a L402 which is precondition for the instant and static service.

[sputn1ck]

I'm getting the following error when running ./regtest.sh start

Error response from daemon: Could not find the file /root/.aperture/tls.cert in container aperture
chmod: cannot access '/tmp/aperture-tls.cert': No such file or directory
lstat /tmp/aperture-tls.cert: no such file or directory

this is the error in my aperture container

unable to parse config file: [6:15] cannot unmarshal uint64 into Go struct field Config.WriteTimeout of type time.Duration
   3 | servestatic: true
   4 | debuglevel: trace
   5 | insecure: false
>  6 | writetimeout: 0
                     ^
   8 | servername: aperture
   9 | autocert: false
  10 | 
  11 | 

[sputn1ck]

tACK! Great job 💯

[bhandras]

Could we also bump the client to 0.18.5 pls.

[hieblmi]

Thank you, I updated it.