Configure signing for release builds

app/build.gradle

@@ -15,8 +15,18 @@ android {
         multiDexEnabled true
     }
 
+    signingConfigs {
+        release {
+            storeFile file(System.getenv("ANDROIDKEYSTOREPATH") ?: "helldivers.keystore")
+            storePassword System.getenv("ANDROIDKEYSTOREPASS") ?: "HelldiversPorLaSuPerTierraYKevinTambien"
+            keyAlias System.getenv("ANDROIDKEYALIAS") ?: "helldivers"
+            keyPassword System.getenv("ANDROIDKEYPASS") ?: "HelldiversPorLaSuPerTierraYKevinTambien"
+        }
+    }
+
     buildTypes {
         release {
+            signingConfig signingConfigs.release
             minifyEnabled true
             proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
             multiDexEnabled true
@@ -27,14 +37,14 @@ android {
     }
 
     compileOptions {
-        sourceCompatibility JavaVersion.VERSION_17
-        targetCompatibility JavaVersion.VERSION_17
+        sourceCompatibility JavaVersion.VERSION_21
+        targetCompatibility JavaVersion.VERSION_21
         coreLibraryDesugaringEnabled true
     }
 
     java {
         toolchain {
-            languageVersion = JavaLanguageVersion.of(17)
+            languageVersion = JavaLanguageVersion.of(21)
         }
     }