refactor rchk action script

[randy3k]

Moving from docker based action to composite action. It allows the action to be used in more complicated settings.

For most users,

  rchk:
    runs-on: ubuntu-latest
    container:
      image: rhub/ubuntu-rchk
      options: --user=root
    steps:
    - uses: actions/checkout@v1
    - uses: r-lib/actions/run-rchk@master

For more complicated usage,

  rchk:
     runs-on: ubuntu-latest
     container:
       image: rhub/ubuntu-rchk
       options: --user=root
     steps:
     - uses: actions/checkout@v1
     - uses: r-lib/actions/run-rchk@master
       with:
         setup-only: true
     - uses: r-lib/actions/setup-r-dependencies@v1
       with:
         cache-version: rchk-1
     - uses: r-lib/actions/run-rchk@master
       with:
         run-only: true

As we are moving away from the docker based action, we have to specify the container in the workflow. It also means that it will break current users. A message will be shown to those users and inform them about the change. Fortunately, there are only a handful of consumers, I could send them PRs once this PR is merged.

Additionally, we need to switch back the docker user to root (which is the default) because rhub/ubuntu-rchk changed it to docker. Without it, we won't have the necessary permission to run things.

    container:
      image: rhub/ubuntu-rchk
      options: --user=root

I have tested the action in the package ustring and the workflow could be found here.

close #380

[codecov-commenter]

Codecov Report

Merging #428 (6f22f50) into master (15cc43b) will not change coverage.
The diff coverage is n/a.

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  Coverage   100.00%   100.00%           
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  Files            1         1           
  Lines            1         1           
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  Hits             1         1           

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[jimhester]

What do you think of the approach used in #380?

[randy3k]

We cannot use other actions for example setup-r-dependencies if running the docker command directly. The current implementation allows users to use any actions or run any arbitrary code. Additionally, they could choose a different docker image as long as it is based on rhub/ubuntu-rchk.

[jimhester]

Ok, sounds good, thanks for the PR!

[github-actions]

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