Add support to secret env vars for containers

[muhamadazmy]

No description provided.

[codecov]

Codecov Report

Merging #502 into master will increase coverage by 0.11%.
The diff coverage is 46.15%.

@@            Coverage Diff             @@
##           master     #502      +/-   ##
==========================================
+ Coverage   36.01%   36.13%   +0.11%     
==========================================
  Files          75       75              
  Lines        5093     5101       +8     
==========================================
+ Hits         1834     1843       +9     
+ Misses       2995     2992       -3     
- Partials      264      266       +2

Impacted Files	Coverage Δ
.../types/provision/tfgrid_reservation_container_1.go	100% <ø> (ø)	⬆️
.../provision/tfgrid_reservation_statsaggregator_1.go	0% <0%> (ø)	⬆️
pkg/container/opts.go	11.45% <100%> (ø)	⬆️
pkg/gedis/commands_provision.go	42.24% <100%> (+3.33%)	⬆️
pkg/provision/container.go	60.13% <16.66%> (-1.91%)	⬇️
pkg/provision/zdb.go	45.09% <75%> (-0.27%)	⬇️

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