provide generic mechanism to propagate global flags to render.Run operations

[grokspawn]

Signed-off-by: Jordan Keister jordan@nimblewidget.com

Description of the change:
Provide a generic mechanism for propagating global flags (i.e. use-http, skip-tls-verify) into any caller of alpha/render/Run().
render.Run is updated to use the passed-in options IFF render.Reg is nil, which allows us to preserve call models which provide a ready containerd registry as well as customize call models which would instantiate the registry at that time.

I attempted to break NO API which is not "real alpha" (as opposed to gradations of alpha). There is a viable backwards-compatible path for all non-veneer APIs.

Motivation for the change:
issue #931

Reviewer Checklist

• Implementation matches the proposed design, or proposal is updated to match implementation
• Sufficient unit test coverage
• Sufficient end-to-end test coverage
• Docs updated or added to /docs
• Commit messages sensible and descriptive

[codecov]

Codecov Report

Merging #986 (5174193) into master (524a11c) will decrease coverage by 0.21%.
The diff coverage is 100.00%.

❗ Current head 5174193 differs from pull request most recent head 9752a22. Consider uploading reports for the commit 9752a22 to get more accurate results

@@            Coverage Diff             @@
##           master     #986      +/-   ##
==========================================
- Coverage   52.86%   52.65%   -0.22%     
==========================================
  Files         104      104              
  Lines        9467     9445      -22     
==========================================
- Hits         5005     4973      -32     
- Misses       3529     3539      +10     
  Partials      933      933              

Impacted Files	Coverage Δ
alpha/action/list.go	73.25% <100.00%> (+0.31%)	⬆️
alpha/declcfg/write.go	73.01% <0.00%> (-9.28%)	⬇️
alpha/veneer/semver/semver.go	58.82% <0.00%> (-3.04%)	⬇️

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[grokspawn]

Tested:

1. opm alpha list bundles
2. opm render
3. opm alpha render-veneer basic
4. opm alpha render-veneer semver
5. opm index add

For each, checked help output as well as successful runs.

[dinhxuanvu]

/approve

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dinhxuanvu, grokspawn

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• OWNERS [dinhxuanvu]

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[perdasilva]

/lgtm