Auto-commit after successful build: improve build setup, update docs/config

Changed files:\n.gitignore
SetupBuildEnvironment.sh
app/build.gradle.kts
keystore.properties.example

app/build.gradle.kts

@@ -1,3 +1,11 @@
+import java.util.Properties
+
+val keystoreProperties = Properties()
+val keystorePropertiesFile = rootProject.file("keystore.properties")
+if (keystorePropertiesFile.exists()) {
+    keystorePropertiesFile.inputStream().use { keystoreProperties.load(it) }
+}
+
 plugins {
     id("com.android.application")
     id("org.jetbrains.kotlin.android")
@@ -11,16 +19,30 @@ android {
         applicationId = "solutions.tretter.githugandroid"
         minSdk = 26
         targetSdk = 34
-        versionCode = 82
-        versionName = "0.1.81"
+        versionCode = 83
+        versionName = "0.1.82"
 
         testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
         vectorDrawables.useSupportLibrary = true
     }
 
+    signingConfigs {
+        if (keystorePropertiesFile.exists()) {
+            create("release") {
+                storeFile = file(keystoreProperties.getProperty("storeFile"))
+                storePassword = keystoreProperties.getProperty("storePassword")
+                keyAlias = keystoreProperties.getProperty("keyAlias")
+                keyPassword = keystoreProperties.getProperty("keyPassword")
+            }
+        }
+    }
+
     buildTypes {
         release {
             isMinifyEnabled = false
+            if (signingConfigs.findByName("release") != null) {
+                signingConfig = signingConfigs.getByName("release")
+            }
             proguardFiles(
                 getDefaultProguardFile("proguard-android-optimize.txt"),
                 "proguard-rules.pro"