GODT-1977: add pre-release flag to app version on qa builds

internal/constants/version_default.go

@@ -0,0 +1,28 @@
+// Copyright (c) 2022 Proton AG
+//
+// This file is part of Proton Mail Bridge.Bridge.
+//
+// Proton Mail Bridge is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Proton Mail Bridge is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Proton Mail Bridge. If not, see <https://www.gnu.org/licenses/>.
+
+//go:build !build_qa
+// +build !build_qa
+
+package constants
+
+import "fmt"
+
+// AppVersion returns the full rendered version of the app (to be used in request headers).
+func AppVersion(version string) string {
+	return fmt.Sprintf("%v-%v@%v", getAPIOS(), AppName, version)
+}