Add command-line signing tooling

.gitignore

@@ -12,3 +12,4 @@
 /captures
 .externalNativeBuild
 .cxx
+keystore.properties

app/build.gradle

@@ -2,6 +2,18 @@ apply plugin: 'com.android.application'
 apply plugin: 'kotlin-android'
 apply plugin: 'kotlin-android-extensions'
 
+def keystoreProperties = new Properties()
+try {
+    def keystorePropertiesFile = rootProject.file("keystore.properties")
+    keystoreProperties.load(new FileInputStream(keystorePropertiesFile))
+} catch (FileNotFoundException ignored) {
+    logger.warn("Unable to load keystore properties. Using debug signing configuration instead")
+    keystoreProperties['keyAlias'] = "androiddebugkey"
+    keystoreProperties['keyPassword'] = "android"
+    keystoreProperties['storeFile'] = new File(System.getProperty("user.home"), ".android/debug.keystore").absolutePath
+    keystoreProperties['storePassword'] = "android"
+}
+
 android {
     compileSdkVersion 29
     defaultConfig {
@@ -13,11 +25,19 @@ android {
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
         signingConfig signingConfigs.debug
     }
+    signingConfigs {
+        release {
+            keyAlias keystoreProperties['keyAlias']
+            keyPassword keystoreProperties['keyPassword']
+            storeFile file(keystoreProperties['storeFile'])
+            storePassword keystoreProperties['storePassword']
+        }
+    }
     buildTypes {
         release {
-            debuggable true
             minifyEnabled true
             proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+            signingConfig signingConfigs.release
         }
     }
     compileOptions {

keystore.properties.sample

@@ -0,0 +1,7 @@
+# suppress inspection "UnusedProperty" for whole file
+# Copy this file to keystore.properties and fill in the correct values to enable signing the app
+# from the command line
+keyAlias=
+keyPassword=
+storeFile=
+storePassword=