Issue #1411 - Document private repository configuration

[alexmt]

Closes #1411

[codecov-io]

Codecov Report

Merging #1515 into master will decrease coverage by 0.29%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master    #1515     +/-   ##
=========================================
- Coverage   42.16%   41.86%   -0.3%     
=========================================
  Files          57       57             
  Lines        8306     8293     -13     
=========================================
- Hits         3502     3472     -30     
- Misses       4288     4310     +22     
+ Partials      516      511      -5

Impacted Files	Coverage Δ
util/webhook/webhook.go	21.34% <0%> (-23.6%)	⬇️
controller/cache/info.go	60% <0%> (-0.84%)	⬇️

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