feat: Use secrets in macros

[sbchaos]

Allows users to use secrets in assets and job configuration.
Exposes a different config .secret so that sensitive configuration are not printed in logs.

[coveralls]

Pull Request Test Coverage Report for Build 1922607126

• 146 of 166 (87.95%) changed or added relevant lines in 6 files are covered.
• 9 unchanged lines in 1 file lost coverage.
• Overall coverage increased (+0.03%) to 72.71%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
run/service.go	2	8	25.0%
run/context.go	114	128	89.06%

Files with Coverage Reduction	New Missed Lines	%
run/context.go	9	64.93%

Totals
Change from base Build 1920645737:	0.03%
Covered Lines:	5222
Relevant Lines:	7182

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💛 - Coveralls

[sravankorumilli]

Lets discuss over a call too, it is better to revisit this entirely, even after refactoring it is still hard to understand.