Give ability to configure the Firebase push gateway.

features/enterprise/api/src/main/kotlin/io/element/android/features/enterprise/api/EnterpriseService.kt

@@ -17,4 +17,6 @@ interface EnterpriseService {
 
     fun semanticColorsLight(): SemanticColors
     fun semanticColorsDark(): SemanticColors
+
+    fun firebasePushGateway(): String?
 }

features/enterprise/impl/src/main/kotlin/io/element/android/features/enterprise/impl/DefaultEnterpriseService.kt

@@ -27,4 +27,6 @@ class DefaultEnterpriseService @Inject constructor() : EnterpriseService {
     override fun semanticColorsLight(): SemanticColors = compoundColorsLight
 
     override fun semanticColorsDark(): SemanticColors = compoundColorsDark
+
+    override fun firebasePushGateway(): String? = null
 }

features/enterprise/test/src/main/kotlin/io/element/android/features/enterprise/test/FakeEnterpriseService.kt

@@ -19,6 +19,7 @@ class FakeEnterpriseService(
     private val defaultHomeserverResult: () -> String? = { A_FAKE_HOMESERVER },
     private val semanticColorsLightResult: () -> SemanticColors = { lambdaError() },
     private val semanticColorsDarkResult: () -> SemanticColors = { lambdaError() },
+    private val firebasePushGatewayResult: () -> String? = { lambdaError() },
 ) : EnterpriseService {
     override suspend fun isEnterpriseUser(sessionId: SessionId): Boolean = simulateLongTask {
         isEnterpriseUserResult(sessionId)
@@ -36,6 +37,10 @@ class FakeEnterpriseService(
         return semanticColorsDarkResult()
     }
 
+    override fun firebasePushGateway(): String? {
+        return firebasePushGatewayResult()
+    }
+
     companion object {
         const val A_FAKE_HOMESERVER = "a_fake_homeserver"
     }