infer the repo and branch on pipeline deploy if not specified

[rberrelleza]

Fixes #1026 and #1027

[pchico83]

Love it!

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@64ddea1). Click here to learn what that means.
The diff coverage is 48.78%.

@@            Coverage Diff            @@
##             master    #1075   +/-   ##
=========================================
  Coverage          ?   34.28%           
=========================================
  Files             ?       65           
  Lines             ?     5366           
  Branches          ?        0           
=========================================
  Hits              ?     1840           
  Misses            ?     3333           
  Partials          ?      193           

Impacted Files	Coverage Δ
cmd/pipeline/deploy.go	16.66% <48.78%> (ø)

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[derek]

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