Fix ci

[Jeidnx]

Fixes the CI Permission issue, see these references for more info:

• https://docs.github.com/en/actions/security-for-github-actions/security-guides/automatic-token-authentication#permissions-for-the-github_token
• https://docs.github.com/en/actions/writing-workflows/workflow-syntax-for-github-actions#permissions

Also switched the android sdk to the version from build.gradle to facilitate reproducible builds (Needed to publish developer-signed apps on F-Droid)

[isaakhanimann]

Thank you!