[PATCH v2 0/3] Make check-whitespace failures more helpful

Add the errors to the job summary along with suggested commands to fix the problem. The commits and filenames are links.

This is for issue #1395. Sample job output [https://github.com/webstech/check-whitespace/actions/runs/3707382446]:

❌ A whitespace issue was found in one or more of the commits.

Run these commands to correct the problem:

1. git rebase --whitespace=fix aaa04a9
2. git push --force

Errors:

1. --- 5cd37f6 Remove annotations
   trailing.txt:4: trailing whitespace.
   +
   trailing.txt:2: new blank line at EOF.

Chris. Webster (3):
  ci (check-whitespace): suggest fixes for errors
  ci (check-whitespace): add links to job output
  ci (check-whitespace): move to actions/checkout@v3

 .github/workflows/check-whitespace.yml | 57 +++++++++++++++++++++-----
 1 file changed, 46 insertions(+), 11 deletions(-)

base-commit: 57e2c6ebbe7108b35ba30184dcbcb6c34c929ad8
Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-1444%2Fwebstech%2Fwhitespace-v2
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-1444/webstech/whitespace-v2
Pull-Request: https://github.com/gitgitgadget/git/pull/1444

Range-diff vs v1:

 1:  67f60e4e5cb ! 1:  a2b5f3e87d6 Make `check-whitespace` failures more helpful
     @@ Metadata
      Author: Chris. Webster <chris@webstech.net>
      
       ## Commit message ##
     -    Make `check-whitespace` failures more helpful
     +    ci (check-whitespace): suggest fixes for errors
      
     -    Add the errors to the job summary along with suggested
     -    commands to fix the problem.
     +    Make the errors more visible by adding them to the job summary and
     +    display the git commands that will usually fix the problem.
      
          Signed-off-by: Chris. Webster <chris@webstech.net>
      
       ## .github/workflows/check-whitespace.yml ##
      @@ .github/workflows/check-whitespace.yml: jobs:
     -   check-whitespace:
     -     runs-on: ubuntu-latest
     -     steps:
     --    - uses: actions/checkout@v2
     -+    - uses: actions/checkout@v3
     -       with:
     -         fetch-depth: 0
     - 
           - name: git log --check
             id: check_out
             run: |
 2:  cdc2b1aae81 ! 2:  342167ef5bd Improve check-whitespace output
     @@ Metadata
      Author: Chris. Webster <chris@webstech.net>
      
       ## Commit message ##
     -    Improve check-whitespace output
     +    ci (check-whitespace): add links to job output
      
          A message in the step log will refer to the Summary output.
      
     -    The job summary output now has links to the commits and files.
     +    The job summary output is using markdown to improve readability.  The
     +    git commands and commits with errors are now in ordered lists.
     +    Commits and files in error are links to the user's repository.
      
          Signed-off-by: Chris. Webster <chris@webstech.net>
      
 -:  ----------- > 3:  aa8cd940940 ci (check-whitespace): move to actions/checkout@v3