Public/Add-GitHubStepSummary.ps1

function Add-GitHubStepSummary {
    [CmdletBinding()]
    param(
        [Parameter(Mandatory)]
        [AllowEmptyString()]
        [AllowEmptyCollection()]
        [string[]] $Content
    )

    Write-GitHubEnvironmentFileContentInternal -VariableName 'GITHUB_STEP_SUMMARY' -Content $Content -Append
}