drone convert --save

[phil-davis]

Description

The last testing app tarball that was created and saved against the latest tag in the testing app was on 2019-08-02. https://drone.owncloud.com/owncloud/testing/592/13/1 Since the drone upgrade, when people follow the instructions in README.md no drone job is triggering.

Maybe there is some problem with detecting that something needs to be triggered when a tag event happens, because the current .drone.yml is the old format (that gets converted on-the-fly when a PR happens).

So this PR saves the converted .drone.yml and hopefully that might trigger the tag event properly.

Then I can do the .drone.starlark implementation.

Checklist:

• [ ] Latest changes are published according to instructions in README.md

[phil-davis]

Doing this in smaller steps. See #114