add OXICLOUD_CHUNK_MAX_BYTES which correspond to the max upload chunk allowed
(differs from OXICLOUD_MAX_UPLOAD_SIZE which is the max total size of a file)
hurl test validate the change
Streams the request body straight to the chunk file with peak heap of
~one HTTP frame, regardless of chunk size or the configured cap. The
`storage.chunk_max_bytes` config (env `OXICLOUD_CHUNK_MAX_BYTES`,
default 100 MB) bounds a single PUT — separate from `max_upload_size`
which governs whole-file uploads. Without this separation, a client
could submit a chunk up to the whole-file cap (10 GB default) and
monopolise server memory.
Edouard Vanbelle
5e638691ad