Add android build CI

android/app/build.gradle

@@ -8,7 +8,7 @@ android {
         minSdkVersion rootProject.ext.minSdkVersion
         targetSdkVersion rootProject.ext.targetSdkVersion
         versionCode 1
-        versionName "1.0"
+        versionName "0.4.3-1"
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
         aaptOptions {
              // Files and dirs to omit from the packaged assets dir, modified to accommodate modern web apps.
@@ -22,6 +22,17 @@ android {
             proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
         }
     }
+    flavorDimensions "channel"
+    productFlavors {
+        play {
+            dimension "channel"
+        }
+
+        fdroid {
+            getIsDefault().set(true)
+            dimension "channel"
+        }
+    }
 }
 
 repositories {