🩹 [Patch]: Adding functions to manage Github Apps on enterprise level

src/functions/public/Enterprise/Get-GitHubEnterpriseInstallableOrganizations.ps1

@@ -0,0 +1,29 @@
+function Get-GitHubEnterpriseInstallableOrganization {
+    <#
+        .SYNOPSIS
+        Get enterprise-owned organizations that can have GitHub Apps installed
+
+        .DESCRIPTION
+        List of organizations owned by the enterprise on which the authenticated GitHub App installation may install other GitHub Apps.
+
+        The authenticated GitHub App must be installed on the enterprise and be granted the Enterprise/enterprise_organization_installations
+        (read) permission.
+
+        .EXAMPLE
+        Get-GitHubEnterpriseInstallableOrganization -Enterprise 'msx'
+    #>
+    [CmdletBinding()]
+    param(
+        # The enterprise slug or id.
+        [Parameter(Mandatory)]
+        [string] $Enterprise
+    )
+    $inputObject = @{
+        APIEndpoint = "/enterprises/$Enterprise/apps/installable_organizations"
+        Method      = 'GET'
+    }
+
+    Invoke-GitHubAPI @inputObject | ForEach-Object {
+        Write-Output $_.Response
+    }
+}

src/functions/public/Enterprise/Install-GitHubAppOnEnterpriseOrganization.ps1

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+function Install-GitHubAppOnEnterpriseOrganization {
+    <#
+        .SYNOPSIS
+        Install an app on an Enterprise-owned organization
+
+        .DESCRIPTION
+        Installs the provided GitHub App on the specified organization owned by the enterprise.
+
+        The authenticated GitHub App must be installed on the enterprise and be granted the Enterprise/organization_installations (write) permission.
+
+        .EXAMPLE
+        Install-GitHubAppOnEnterpriseOrganization -Enterprise 'msx' -Organization 'org' -ClientID '123456'
+    #>
+    [CmdletBinding()]
+    param(
+        # The enterprise slug or ID.
+        [Parameter(Mandatory)]
+        [string] $Enterprise,
+
+        # The organization name. The name is not case sensitive.
+        [Parameter(Mandatory)]
+        [string] $Organization,
+
+        # The client ID of the GitHub App to install.
+        [Parameter(Mandatory)]
+        [string] $ClientID,
+
+        # The repository selection for the GitHub App. Can be one of:
+        # - all - all repositories that the authenticated GitHub App installation can access.
+        # - selected - select specific repositories.
+        [Parameter()]
+        [ValidateSet('all', 'selected')]
+        [string] $RepositorySelection = 'all',
+
+        # The names of the repositories to which the installation will be granted access.
+        [Parameter()]
+        [string[]] $Repositories
+    )
+
+    $body = @{
+        client_id            = $ClientID
+        repository_selection = $RepositorySelection
+        repositories         = $Repositories
+    }
+    $body | Remove-HashtableEntry -NullOrEmptyValues
+
+    $inputObject = @{
+        APIEndpoint = "/enterprises/$Enterprise/apps/organizations/$Organization/installations"
+        Method      = 'Post'
+        Body        = $body
+    }
+
+    Invoke-GitHubAPI @inputObject | ForEach-Object {
+        Write-Output $_.Response
+    }
+}