Enable release keysigning for APK

AppImageBuilder.yml

@@ -2,10 +2,7 @@
 version: 1
 script:
   - rm -rf AppDir || true
-  - rm -rf build || true
   - rm -rf appimage-build
-  - flutter pub get
-  - flutter build linux
   - cp -r build/linux/x64/release/bundle AppDir
   - mkdir -p AppDir/usr/share/icons/hicolor/64x64/apps
   - cp Icons/PNG/nbteditor.png AppDir/usr/share/icons/hicolor/64x64/apps/
@@ -34,13 +31,13 @@ AppDir:
       - libwayland-cursor0
   files:
     include:
-    - /lib64/ld-linux-x86-64.so.2
+      - /lib64/ld-linux-x86-64.so.2
     exclude:
-    - usr/share/man
-    - usr/share/doc/*/README.*
-    - usr/share/doc/*/changelog.*
-    - usr/share/doc/*/NEWS.*
-    - usr/share/doc/*/TODO.*
+      - usr/share/man
+      - usr/share/doc/*/README.*
+      - usr/share/doc/*/changelog.*
+      - usr/share/doc/*/NEWS.*
+      - usr/share/doc/*/TODO.*
 AppImage:
   arch: x86_64
   update-information: guess

android/app/build.gradle

@@ -5,6 +5,12 @@ plugins {
     id "dev.flutter.flutter-gradle-plugin"
 }
 
+def keystoreProperties = new Properties()
+def keystorePropertiesFile = rootProject.file('key.properties')
+if (keystorePropertiesFile.exists()) {
+    keystoreProperties.load(new FileInputStream(keystorePropertiesFile))
+}
+
 android {
     namespace = "dev.zontreck.nbteditor"
     compileSdk = flutter.compileSdkVersion
@@ -30,11 +36,20 @@ android {
         versionName = flutter.versionName
     }
 
+    signingConfigs {
+        release {
+            keyAlias = keystoreProperties["keyAlias"]
+            keyPassword = keystoreProperties["keyPassword"]
+            storeFile = keystoreProperties["storeFile"] ? file(keystoreProperties["storeFile"]) : null
+            storePassword = keystoreProperties["storePassword"]
+        }
+    }
+
     buildTypes {
         release {
             // TODO: Add your own signing config for the release build.
             // Signing with the debug keys for now, so `flutter run --release` works.
-            signingConfig = signingConfigs.debug
+            signingConfig = signingConfigs.release
         }
     }
 }