Adding a basic CI deployments

[anxolin]

Add CI with Github actions

Also, a bit out of scope of the PR (sorry for mixing it in here)

• Adding Gnosis Protocol Buffers token file
• Handle timeout for fetching from coingecko

Test

• Verify this CI worked! https://github.com/cowprotocol/token-lists/actions/runs/3211010478
• Try to download the built files and verify they are all there:

Out of scope

S3 deployment and PRaul

[bh2smith]

HOP token should not be on this list: cf https://cowservices.slack.com/archives/C035N0YEB6J/p1665236850941809?thread_ts=1665061492.268509&cid=C035N0YEB6J