add E2E_BACKEND to override local electrum

Author: piotr-iohk

app/build.gradle.kts

@@ -37,6 +37,7 @@ val keystoreProperties by lazy {
 }
 
 val locales = listOf("en", "ar", "ca", "cs", "de", "el", "es", "fr", "it", "nl", "pl", "pt", "ru")
+val e2eBackendEnv = System.getenv("E2E_BACKEND") ?: "local"
 
 android {
     namespace = "to.bitkit"
@@ -52,6 +53,7 @@ android {
             useSupportLibrary = true
         }
         buildConfigField("boolean", "E2E", System.getenv("E2E")?.toBoolean()?.toString() ?: "false")
+        buildConfigField("String", "E2E_BACKEND", "\"$e2eBackendEnv\"")
         buildConfigField("boolean", "GEO", System.getenv("GEO")?.toBoolean()?.toString() ?: "true")
         buildConfigField("String", "LOCALES", "\"${locales.joinToString(",")}\"")
     }

app/src/main/java/to/bitkit/env/Env.kt

@@ -17,6 +17,7 @@ internal object Env {
     val isDebug = BuildConfig.DEBUG
     const val isE2eTest = BuildConfig.E2E
     const val isGeoblockingEnabled = BuildConfig.GEO
+    private val e2eBackend = BuildConfig.E2E_BACKEND.lowercase()
     val network = Network.valueOf(BuildConfig.NETWORK)
     val locales = BuildConfig.LOCALES.split(",")
     val walletSyncIntervalSecs = 10_uL // TODO review
@@ -98,7 +99,7 @@ internal object Env {
 
     val electrumServerUrl: String
         get() {
-            if (isE2eTest) return ElectrumServers.E2E
+            if (isE2eTest && e2eBackend == "local") return ElectrumServers.E2E
             return when (network) {
                 Network.REGTEST -> ElectrumServers.REGTEST
                 Network.TESTNET -> ElectrumServers.TESTNET