Add Fastlane

Gemfile

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+source "https://rubygems.org"
+
+gem "fastlane"

fastlane/Appfile

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+json_key_file("") # Path to the json secret file - Follow https://docs.fastlane.tools/actions/supply/#setup to get one
+package_name("org.joinmastodon.android") # e.g. com.krausefx.app

fastlane/Fastfile

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+# This file contains the fastlane.tools configuration
+# You can find the documentation at https://docs.fastlane.tools
+#
+# For a list of all available actions, check out
+#
+#     https://docs.fastlane.tools/actions
+#
+# For a list of all available plugins, check out
+#
+#     https://docs.fastlane.tools/plugins/available-plugins
+#
+
+# Uncomment the line if you want fastlane to automatically update itself
+# update_fastlane
+
+default_platform(:android)
+
+platform :android do
+  desc "Runs all the tests"
+  lane :test do
+    gradle(task: "test")
+  end
+
+  desc "Deploy a new version to the Google Play"
+  lane :deploy do
+    gradle(
+      task: "bundle",
+      build_type: "release",
+      properties: {
+        "android.injected.signing.store.file" => ENV["KEYSTORE_FILE"],
+        "android.injected.signing.store.password" => ENV["KEYSTORE_PASSWORD"],
+        "android.injected.signing.key.alias" => "key0",
+        "android.injected.signing.key.password" => ENV["KEYSTORE_PASSWORD"],
+      }
+    )
+    upload_to_play_store(
+      changes_not_sent_for_review: true
+    )
+  end
+end

fastlane/README.md

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+fastlane documentation
+----
+
+# Installation
+
+Make sure you have the latest version of the Xcode command line tools installed:
+
+```sh
+xcode-select --install
+```
+
+For _fastlane_ installation instructions, see [Installing _fastlane_](https://docs.fastlane.tools/#installing-fastlane)
+
+# Available Actions
+
+## Android
+
+### android test
+
+```sh
+[bundle exec] fastlane android test
+```
+
+Runs all the tests
+
+### android deploy
+
+```sh
+[bundle exec] fastlane android deploy
+```
+
+Deploy a new version to the Google Play
+
+----
+
+This README.md is auto-generated and will be re-generated every time [_fastlane_](https://fastlane.tools) is run.
+
+More information about _fastlane_ can be found on [fastlane.tools](https://fastlane.tools).
+
+The documentation of _fastlane_ can be found on [docs.fastlane.tools](https://docs.fastlane.tools).