Introduce support for looking up GH app installation ID

Signed-off-by: Matheus Pimenta <matheuscscp@gmail.com>

pkg/manifestgen/sourcesecret/options.go

@@ -77,10 +77,11 @@ type Options struct {
 	Address             string
 
 	// GitHub App options
-	GitHubAppID             string
-	GitHubAppInstallationID string
-	GitHubAppPrivateKey     string
-	GitHubAppBaseURL        string
+	GitHubAppID                string
+	GitHubAppInstallationOwner string
+	GitHubAppInstallationID    string
+	GitHubAppPrivateKey        string
+	GitHubAppBaseURL           string
 }
 
 type VerificationCrt struct {

pkg/manifestgen/sourcesecret/sourcesecret.go

@@ -235,13 +235,22 @@ func GenerateNotation(options Options) (*manifestgen.Manifest, error) {
 }
 
 func GenerateGitHubApp(options Options) (*manifestgen.Manifest, error) {
+	var opts []secrets.GitHubAppOption
+	if owner := options.GitHubAppInstallationOwner; owner != "" {
+		opts = append(opts, secrets.WithGitHubAppInstallationOwner(owner))
+	}
+	if id := options.GitHubAppInstallationID; id != "" {
+		opts = append(opts, secrets.WithGitHubAppInstallationID(id))
+	}
+	if u := options.GitHubAppBaseURL; u != "" {
+		opts = append(opts, secrets.WithGitHubAppBaseURL(u))
+	}
 	secret, err := secrets.MakeGitHubAppSecret(
 		options.Name,
 		options.Namespace,
 		options.GitHubAppID,
-		options.GitHubAppInstallationID,
 		options.GitHubAppPrivateKey,
-		options.GitHubAppBaseURL,
+		opts...,
 	)
 	if err != nil {
 		return nil, err