Add minimal support for the api-secret-key config flag

Related to gitlab#28781 and
#253.

acceptance_test.go

@@ -1513,3 +1513,9 @@ func TestTLSVersions(t *testing.T) {
 		})
 	}
 }
+
+func TestApiSecretKeyFlagIsSupported(t *testing.T) {
+	skipUnlessEnabled(t)
+	teardown := RunPagesProcess(t, *pagesBinary, listeners, "", "-api-secret-key", "/path/to/secret.key")
+	defer teardown()
+}

main.go

@@ -57,6 +57,7 @@ var (
 	secret                 = flag.String("auth-secret", "", "Cookie store hash key, should be at least 32 bytes long.")
 	gitLabAuthServer       = flag.String("auth-server", "", "DEPRECATED, use gitlab-server instead. GitLab server, for example https://www.gitlab.com")
 	gitLabServer           = flag.String("gitlab-server", "", "GitLab server, for example https://www.gitlab.com")
+	gitLabAPISecretKey     = flag.String("api-secret-key", "", "File with secret key used to authenticate with the GitLab API")
 	clientID               = flag.String("auth-client-id", "", "GitLab application Client ID")
 	clientSecret           = flag.String("auth-client-secret", "", "GitLab application Client Secret")
 	redirectURI            = flag.String("auth-redirect-uri", "", "GitLab application redirect URI")