Allow disabling cache in setup-r-dependencies

[Bisaloo]

Is your feature request related to a problem? Please describe.

I'm trying to use act to test workflows locally and avoid spamming commits when I'm developing a complex workflow. Unfortunately, it looks like act doesn't support caching and fails whenever caching is included in a step.

Describe the solution you'd like

I would like to have a way to disable the cache in setup-r-dependencies. Then, it would be possible for act users to do:

- uses: r-lib/actions/setup-r-dependencies@v2
  with:
    cache: ${{ !env.ACT }}

Describe alternatives you've considered

I can't think of any other good alternative. The only option would be to go way to the 'old' way of manually installing dependencies (with remotes) but it means losing all the benefit brought by setup-r-dependencies.

[gaborcsardi]

Do you want to submit a PR?

[Bisaloo]

I'm really confused because I was thinking https://github.com/Bisaloo/actions/commit/f4a22e74b7856a66b20aa93365141a2fbb80810d would be enough but it doesn't look like it's working 🤔

gh::gh("/repos/{owner}/{repo}/actions/cache/usage", owner = "Bisaloo", repo = "testpkg")
#> {
#>   "full_name": "Bisaloo/testpkg",
#>   "active_caches_size_in_bytes": 4860071,
#>   "active_caches_count": 1
#> }

^{Created on 2022-03-23 by the reprex package (v2.0.1.9000)}

https://github.com/Bisaloo/testpkg/blob/main/.github/workflows/R-CMD-check.yaml

[riccardoporreca]

@Bisaloo, I think you need to do use comparison, see e.g.

actions/run-rchk/action.yml

Lines 19 to 27 in 1efdaa6

	- if: inputs.run-only != 'true'
	name: Setup rchk
	run: bash $GITHUB_ACTION_PATH/setup.sh
	shell: bash
	- if: inputs.setup-only != 'true' && inputs.run-only != 'true'
	uses: r-lib/actions/setup-r-dependencies@v2
	with:
	cache-version: ${{ inputs.cache-version }}
	- if: inputs.setup-only != 'true'

Also note you do not need {{ ... }}

[Bisaloo]

Ah yes, thanks, that seems to have done the trick! It's quite strange you cannot use boolean values directly

[github-actions]

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