Configure signed Android release builds

android/app/build.gradle

@@ -1,6 +1,15 @@
 apply plugin: 'com.android.application'
 apply plugin: 'org.jetbrains.kotlin.android'
 
+def apiBaseUrl = project.findProperty("API_BASE_URL") ?: "https://sign.linkedcorp.net/api"
+def keystoreProperties = new Properties()
+def keystorePropertiesFile = rootProject.file("keystore.properties")
+def hasReleaseKeystore = keystorePropertiesFile.exists()
+
+if (hasReleaseKeystore) {
+    keystoreProperties.load(new FileInputStream(keystorePropertiesFile))
+}
+
 android {
     namespace 'net.linkedcorp.linkedsign'
     compileSdk 35
@@ -12,7 +21,18 @@ android {
         versionCode 1
         versionName "0.1.0"
 
-        buildConfigField "String", "API_BASE_URL", "\"http://192.168.222.72:4000\""
+        buildConfigField "String", "API_BASE_URL", "\"${apiBaseUrl}\""
+    }
+
+    signingConfigs {
+        if (hasReleaseKeystore) {
+            release {
+                storeFile rootProject.file(keystoreProperties['storeFile'])
+                storePassword keystoreProperties['storePassword']
+                keyAlias keystoreProperties['keyAlias']
+                keyPassword keystoreProperties['keyPassword']
+            }
+        }
     }
 
     buildTypes {
@@ -22,6 +42,9 @@ android {
         release {
             minifyEnabled false
             proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+            if (hasReleaseKeystore) {
+                signingConfig signingConfigs.release
+            }
         }
     }