fix: gzip encoded - force deflate

[kptdobe]

This PR is a part of the fix for wrongly encoded files in R2:

During the bucket migration (from @auniverseaway to Franklin-dev) and for an unknown reason (wrong cache headers ?), some documents got wrongly encoded in the destination bucket - documents are gzip encoded with the source content type.

This cause a weird issue: not sure what happens in production, but when running locally, the worker hangs forever when reading the S3 client response body and is then completely unreachable - it has to be reloaded. I assume in prod, the request just times out. Consequence: empty page in authoring and content is never written to the file.

This PR addresses the GET problem. But it is not enough because the write crashes then (Failed to update document Error: 411 - Length Required in da-collab). Probably a similar trick could be found.

But I will not investigate further. I'll just make a console.warn to detect the corrupted documents and from time to time, run a script to clean up the few remaining corrupted files (script here: https://github.com/kptdobe/da-magic/blob/main/encoding/fix-s3-document-encoding.sh).

[codecov]

Codecov Report

❌ Patch coverage is 76.92308% with 3 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/storage/object/get.js	76.92%	3 Missing ⚠️

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