squash! Modify build system

Bug 40143: Use deterministic date in Test apk

The build config was using Date() when generating the Test apk's
versionName.

buildSrc/src/main/java/Config.kt

@@ -19,7 +19,12 @@ object Config {
 
     @JvmStatic
     private fun generateDebugVersionName(): String {
-        val today = Date()
+        val today = if (System.getenv("MOZ_BUILD_DATE") != null) {
+            val format = SimpleDateFormat("yyyyMMddHHmmss", Locale.US)
+            format.parse(System.getenv("MOZ_BUILD_DATE"))
+        } else {
+            Date()
+        }
         // Append the year (2 digits) and week in year (2 digits). This will make it easier to distinguish versions and
         // identify ancient versions when debugging issues. However this will still keep the same version number during
         // the week so that we do not end up with a lot of versions in tools like Sentry. As an extra this matches the