examples for `opm render` to generate channel graph images

[grokspawn]

Signed-off-by: Jordan Keister [email protected]

Description of the change: Adding examples of opm render so that we can provide examples of the more complex pipelines required to generate a picture of operator upgrade graphs.

Motivation for the change:

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

[openshift-ci[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: grokspawn

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[codecov[bot]]

Codecov Report

Merging #1012 (f9023d9) into master (63c1932) will increase coverage by 0.01%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1012      +/-   ##
==========================================
+ Coverage   51.67%   51.68%   +0.01%     
==========================================
  Files         102      102              
  Lines        9153     9153              
==========================================
+ Hits         4730     4731       +1     
+ Misses       3515     3514       -1     
  Partials      908      908              

Impacted Files	Coverage Δ
alpha/veneer/semver/semver.go	60.50% <0.00%> (+0.50%)	:arrow_up:

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[bentito]

/lgtm

[grokspawn]

/hold really want #1013 to close first, and rehash this as examples against the new command

[perdasilva]

/lgtm

[perdasilva]

/approved

[perdasilva]

~~/hold cancel https://github.com/operator-framework/operator-registry/pull/1013 has been merged~~ realised you want to rehash the examples

[grokspawn]

/hold cancel re-worked the examples given the new context

[bentito]

/lgtm