1. Install Flutter
2. Run flutter pub get

Create a android/key.properties that looks like this:

storePassword=example
keyPassword=example
keyAlias=key
storeFile=/path/to/keystore.jks

Follow Flutter's Android signing guide for more details.

I used the flutter_launcher_icons package for that, so follow these instructions.

Follow these steps.

1. Update CHANGELOG.md
2. Bump the version number in pubspec.yaml
3. Run flutter analyze && flutter test
4. Run flutter build apk --split-per-abi
5. Rename the output files to notifier-v<VERSION>-<ABI>.apk
6. Create a git tag in the format v#.#.#
7. Create a GitHub release with the release notes and .apk