add b2 syncing for sqlite base

[mchangrh]

Implementation notes

this uses a custom GHA since the alternatives were horribly outdated https://github.com/mchangrh/s3cmd-sync

Secrets from B2 are as follows:

• read and write access is required to verify that files were uploaded
• S3_ACCESS_KEY_ID = keyID
• S3_ACCESS_KEY_SECRET = applicationKey
• S3_BUCKET = B2 bucket name
• S3_ENDPOINT = s3.us-west-000.backblazeb2.com or similar format

[ajayyy]

This is for auto uploading an sqlite base to some b2 bucket I setup so it can be downloaded by sb-mirror?

[mchangrh]

Yes that exactly