Create workflow to run differential tests at set intervals

[razgraf]

A workflow that it triggered automatically once per week (or even day) should be implemented to run the differential tests from protocol-envio/test and merkle-envio/test.

Some caveats to consider:

• If the indexer reaches a block faster than the subgraph, the test will fail - this is somewhat of a false-positive as indexing speed is a good thing, so tests should be adapted for this caveat
• The tests could be run against two separate subgraphs (different chain) for even more reassurance
• Separately, availability tests could be considered for all subgraphs and indexers