Run pkgdown for published releases and on workflow_dispatch

[jennybc]

Closes #450

[jennybc]

If we pursue this, I can figure out if / how to update the section of examples/README.md.

[codecov-commenter]

Codecov Report

Merging #451 (6d7dff1) into master (61009b5) will not change coverage.
The diff coverage is n/a.

❗ Current head 6d7dff1 differs from pull request most recent head abac6a3. Consider uploading reports for the commit abac6a3 to get more accurate results

@@            Coverage Diff            @@
##            master      #451   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines            1         1           
=========================================
  Hits             1         1           

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[gaborcsardi]

If we pursue this, I can figure out if / how to update the section of examples/README.md.

Didn't you already update that in this PR?

[jennybc]

The auto-inclusion of the yaml happened, but I think the prose should change too, i.e. the bit that only a human can do.

[jennybc]

I added a sentence to README.

[gaborcsardi]

Thanks! I am not sure why we build examples/README.md in an action. I guess it keeps the README consistent with the YAML, but we could still just build it locally whenever we change an example.

Anyway, I am merging this, and adding it to v1.

[jennybc]

I am not sure why we build examples/README.md in an action. I guess it keeps the README consistent with the YAML, ..

Yeah what you say and perhaps a bit of dog-fooding.

[jennybc]

I wasn't really worried, but I've just successfully exercised the releases.published change via the usethis release of v2.1.5:

https://github.com/r-lib/usethis/actions/workflows/pkgdown.yaml

[github-actions]

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