Fastlane: Add a lane to build + upload to playstore

In the alpha version for now. The --build-number flag fails right now,
this seems to be a regression in flutter which has been fixed, but the
new version has yet to be released.

So, when I put this into a proper CI, it's going to fail :(

android/fastlane/Fastfile

@@ -1,23 +1,21 @@
 default_platform(:android)
 
 platform :android do
-  desc "Runs all the tests"
-  lane :test do
-    gradle(task: "test")
-  end
+  desc "Build a new Android APK"
+  lane :alphaBuild do
+    # Return the number of commits in current git branch
+    build_number = number_of_commits()
+    Dir.chdir "../../" do
+      #sh("flutter", "packages", "get")
+      #sh("flutter", "clean")
+      #sh("flutter", "build", "apk", "--build-number=#{build_number}")
+    end
 
-  desc "Submit a new Beta Build to Crashlytics Beta"
-  lane :beta do
-    gradle(task: "clean assembleRelease")
-    crashlytics
-  
-    # sh "your_script.sh"
-    # You can also use other beta testing services here
-  end
-
-  desc "Deploy a new version to the Google Play"
-  lane :deploy do
-    gradle(task: "clean assembleRelease")
-    upload_to_play_store
+    upload_to_play_store(track: "alpha",
+      apk: "../build/app/outputs/apk/release/app-release.apk",
+      skip_upload_metadata: true,
+      skip_upload_images: true,
+      skip_upload_screenshots: true,
+    )
   end
 end