Generate random password

[adelowo]

Fixes #4931

• Added a new cli flag -random-password
• Added a new cli flag -random-password-length for configuring length of generated password
• Generate a random password with generate.GetRandomString

Thoughts ?

[codecov-io]

Codecov Report

Merging #5023 into master will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #5023      +/-   ##
==========================================
+ Coverage   37.47%   37.48%   +0.01%     
==========================================
  Files         310      310              
  Lines       45935    45935              
==========================================
+ Hits        17213    17220       +7     
+ Misses      26244    26241       -3     
+ Partials     2478     2474       -4

Impacted Files	Coverage Δ
models/repo_list.go	62.2% <0%> (-1.17%)	⬇️
models/repo_indexer.go	48.3% <0%> (+3.81%)	⬆️

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[lafriks]

If implemented sending email should probably be optional with special flag

[adelowo]

If implemented sending email should probably be optional with special flag

Will add that

[adelowo]

@lafriks I couldn't get emails to work... Would work on that and send another PR in the future