feat: add publish workflow

[mcatta]

In order to make this workflow executable we need the following action items:

• [ ] Change the permissions related to the secrets.GITHUB_TOKEN: repository settings > Actions > General, then clicks on: Read and write permissions
• [ ] We need to add two actions SECRETS: RELEASE_KEYSTORE which will contain the encrypted release.keystore and RELEASE_KEYSTORE_PASSPHRASE which will contain the gpg passphrase that decrypt the keystone.

The guide to creating those two secrets is here: https://stefma.medium.com/how-to-store-a-android-keystore-safely-on-github-actions-f0cef9413784 we can do it together.

[Swordfish90]

Thank you very much @mcatta . Merged added the two secrets. I guess will see it live as soon as I publish a tag! :smile: