Updated metadata schema URL

[aidanheerdegen]

The location of the metadata schema is changing

ACCESS-NRI/schema#12

This will require an update to the URL in metadata.py

payu/payu/metadata.py

Line 39 in 421431b

SCHEMA_URL = "https://raw.githubusercontent.com/ACCESS-NRI/schema/main/experiment_asset.json"

We will need flag that this is being deprecated and when that file is removed it will break existing deployed versions of payu.

Note for the future, if we had used a specific commit then there would be no problem with deleting/moving the file in the schema repo, i.e.

https://raw.githubusercontent.com/ACCESS-NRI/schema/36abe2fe28eb2853a54f41c5eedfd964617d9d68/experiment_asset.json

rather than

https://raw.githubusercontent.com/ACCESS-NRI/schema/main/experiment_asset.json

[aidanheerdegen]

Metadata URL was updated in #434 but we should keep this open until we deprecate deployed versions of payu with old URL location.

AFAICT this only affects a single deployed version:

/g/data/vk83/apps/payu/1.1

When we deploy the next version we should add a deprecation notice to the 1.1 version module file and once we have a couple of versions deployed over the top it should be fine to remove that version and the deprecated schema file and close this issue.