fix(cloud-native): resolve image builds on slow network

[iromli]

Slow network may causes these build errors:

1. Failed git clone:

   #0 0.279 Cloning into '/tmp/jans'...
   #0 85.87 error: RPC failed; curl 92 HTTP/2 stream 1 was not closed cleanly: CANCEL (err 8)
   #0 85.87 error: 30 bytes of body are still expected
   #0 85.89 fetch-pack: unexpected disconnect while reading sideband packet
   #0 85.89 fatal: early EOF
   #0 85.89 fatal: fetch-pack: invalid index-pack output
   

2. Timed-out pip install

There should be configurable build arguments to run git clone and pip install.