apk release automated

[armaanbadhan]

Description

added a release_draft workflow. which creates a draft with signed apk of the app.

Issue Resolved

closes #136

Steps to follow:

1. open android studio -> build -> generate signed bundle/apk -> apk -> create new. remember the credentials
2. convert the newly generated jsk file to base64 string using any online tool.
3. on github, go to settings -> secrets and variables -> actions -> new repo secret.
   
   create all these, signing_key is the base64 string.
4. in your terminal run the command keytool -list -v -keystore {jsk file path} -alias {alias}
5. enter passwords and copy the sha1 and sha256 fingerprints and add them to your firebase console.

ez

Checklist

Please make sure to review the following before submitting your PR:

• I have read the contribution guidelines.
• I have read the code of conduct.
• I have reviewed my submission in detail.

[ken1000minus7]

Lgtm