Allow GitHubRunner as a project setting

[aholstrup1]

Allow GitHubRunner as a project setting. This would enable us to compile apps on linux-based GitHub runners while running the tests on either windows GitHub runners or self-hosted runners.

[freddydk]

These lines at the end of ReadSettings should be removed:

$gitHubRunner = $settings.githubRunner.Split(',').Trim() | ConvertTo-Json -compress
Add-Content -Encoding UTF8 -Path $env:GITHUB_OUTPUT -Value "GitHubRunnerJson=$githubRunner"
Write-Host "GitHubRunnerJson=$githubRunner"

$gitHubRunnerShell = $settings.githubRunnerShell
Add-Content -Encoding UTF8 -Path $env:GITHUB_OUTPUT -Value "GitHubRunnerShell=$githubRunnerShell"
Write-Host "GitHubRunnerShell=$githubRunnerShell"

and these lines in the corresponding action.yaml:

outputs:
  GitHubRunnerJson:
    description: GitHubRunner in compressed Json format
    value: ${{ steps.readsettings.outputs.GitHubRunnerJson }}
  GitHubRunnerShell:
    description: Shell for GitHubRunner jobs
    value: ${{ steps.readsettings.outputs.GitHubRunnerShell }}

and these lines in the corresponding readme.md should be replaced by none:

| Name | Description |
| :-- | :-- |
| GitHubRunnerJson | GitHubRunner in compressed Json format |
| GitHubRunnerShell | Shell for GitHubRunner jobs |

Nobody should use this output.

[freddydk]

Looks good - I like the change
Added a comment with requested changes (to remove the outputs from ReadSettings)

[aholstrup1]

Looks good - I like the change Added a comment with requested changes (to remove the outputs from ReadSettings)

So.. We're still using these outputs a couple of places. Specifically, in BuildPP:

AL-Go/Templates/Per Tenant Extension/.github/workflows/CICD.yaml

Lines 174 to 175 in 67b4489

	shell: ${{ needs.Initialization.outputs.githubRunnerShell }}
	runsOn: ${{ needs.Initialization.outputs.githubRunner }}

And CreateDevelopmentEnvironment

AL-Go/Templates/AppSource App/.github/workflows/CreateOnlineDevelopmentEnvironment.yaml

Line 103 in 67b4489

runs-on: ${{ fromJson(needs.Initialization.outputs.githubRunner) }}

How do we get rid of those dependencies in an appropriate way?

For PP we could output the runner + runnerShell from:

AL-Go/Templates/Per Tenant Extension/.github/workflows/CICD.yaml

Lines 82 to 86 in 520a241

	- name: Determine PowerPlatform Solution Folder
	id: DeterminePowerPlatformSolutionFolder
	if: env.type == 'PTE'
	run: |
	Add-Content -Encoding UTF8 -Path $env:GITHUB_OUTPUT -Value "powerPlatformSolutionFolder=$($env:powerPlatformSolutionFolder)"

Maybe we can do something similar for CreateDevelopmentEnvironment. Thoughts? Something like this:
aholstrup1#50