ci: added git-cliff changelog automation

[shamykyzer]

● Closes #41.

Adds git-cliff changelog automation. NEWS.md entries are generated from
Conventional-Commits PR titles, run locally by the release manager before tagging.

• cliff.toml: git-cliff config (groups by type, filters to V* tags, links (#NNN) to PRs, skips noise).
• CONTRIBUTING.md: documents the PR-title convention and release command.
• .Rbuildignore: excludes cliff.toml from the package tarball.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (51810ca) to head (d7acb7a).

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #49   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files            4         4           
  Lines          115       115           
=========================================
  Hits           115       115           

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[shamykyzer]

Hello @rpreen, could you have a look at this and let me know what you think?

[rpreen]

I just took a quick look at this and I think the config needs tweaking - if you look at the toml in the Python ACRO repo I made some changes before it was merged - in particular there needs to be a default fall through with category 'other' to handle the cases where someone has merged/committed to the main branch without using conventional commits.

[shamykyzer]

Hi @rpreen, could you please have a look at my changes? I can't seem to pass the macOS CI check either..

[JessUWE]

@shamykyzer Can you look through our stand-up notes and see if any of the suggestions would help.

[shamykyzer]

Again, sorry @JessUWE for not checking the stand-up notes, this should be good to merge now.

I switched to reticulate's own Python resolver instead of blindly picking the first python3 in PATH, which was failing on conda runners.

Before:

python <- get_python()

After:

python <- reticulate::virtualenv_starter()
if (is.null(python)) python <- get_python()

[jim-smith]

Again, sorry @JessUWE for not checking the stand-up notes, this should be good to merge now.

I switched to reticulate's own Python resolver instead of blindly picking the first python3 in PATH, which was failing on conda runners.

Before:

python <- get_python()

After:

python <- reticulate::virtualenv_starter()
if (is.null(python)) python <- get_python()

@shamykyzer need to check this logic (using reticulate's resolver), because 'it's hard to install the R version" is a really common complaint from TREs.

We need to make sure that we pick up the version of python that has acro installed - this will/should be in a virtual environment of its own, and that env should be pushed to the front of PATH - but all the relevant info should be in the installation / help guides