implement dedicated summon provider (#1436)

[ckolumbus]

initial implementation of a dedicated summon-provider implementation for gopass as the default output behavior of gopass violates the summon contract by adding all meta data.
This implementation outputs only the secret, no other special handling is implemented.

[dominikschulz]

This looks very good already.
Some cleanup and finishing the tests and this should be ready to merge.

[ckolumbus]

Test implemented, refactoring of outputting done. How can i fix the CommitCheck errors?

[codecov-commenter]

Codecov Report

Merging #1438 into master will decrease coverage by 0.24%.
The diff coverage is 17.50%.

@@            Coverage Diff             @@
##           master    #1438      +/-   ##
==========================================
- Coverage   64.34%   64.09%   -0.24%     
==========================================
  Files         203      205       +2     
  Lines       11592    11647      +55     
==========================================
+ Hits         7458     7465       +7     
- Misses       3323     3370      +47     
- Partials      811      812       +1     

Impacted Files	Coverage Δ
cmd/gopass-summon-provider/main.go	0.00% <0.00%> (ø)
cmd/gopass-summon-provider/summon-provider.go	77.78% <77.78%> (ø)
pkg/ctxutil/ctxutil.go	90.50% <0.00%> (-4.31%)	⬇️
internal/action/show.go	46.09% <0.00%> (-1.49%)	⬇️

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[dominikschulz]

CommitCheck wants a RELEASE_NOTES=... tag in all commits. This will be used to assemble the release notes.

[ckolumbus]

CommitCheck wants a RELEASE_NOTES=... tag in all commits. This will be used to assemble the release notes.

@dominikschulz could you maybe provide a link to some examples? What are the best practices for this in case of several (unimportant) check-ins? Squashing?

[dominikschulz]

Yes, we usually squash commits in a PR.

[ckolumbus]

@dominikschulz sorry for bothering you again:

CommitCheck wants a RELEASE_NOTES=... tag

so I squash everything and add one RELEASE_NOTES tag?

[dominikschulz]

Yes, that's how I'd it.
I'd prefer to only require that tag for the merge commit but couldn't figure out how to do that reliably.