adds e2e tests for api server

[patilpankaj212]

1. api server tests
2. fix minor defects
3. make api server port configurable

[codecov]

Codecov Report

Merging #585 (5dc545f) into master (6728908) will decrease coverage by 0.37%.
The diff coverage is 5.00%.

@@            Coverage Diff             @@
##           master     #585      +/-   ##
==========================================
- Coverage   78.02%   77.65%   -0.38%     
==========================================
  Files         102      102              
  Lines        2512     2524      +12     
==========================================
  Hits         1960     1960              
- Misses        408      420      +12     
  Partials      144      144              

Impacted Files	Coverage Δ
pkg/cli/init.go	25.00% <0.00%> (ø)
pkg/cli/server.go	20.00% <0.00%> (ø)
pkg/http-server/file-scan.go	73.26% <0.00%> (-7.17%)	⬇️
pkg/http-server/remote-repo.go	69.64% <0.00%> (ø)
pkg/http-server/start.go	0.00% <0.00%> (ø)
pkg/config/config-reader.go	85.71% <100.00%> (ø)

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication