Publish ZIM files to IPFS

We are moving forward to use IPFS as (part of) distribution strategy.

Therefore we need to publish (part of) all of our ZIM files on IPFS.

The uploading of ZIM files is usually the duty of Zimfarm, the "CMS" been then in charge to decide if we put them in the official published library (or not).

The point here is that there is a difficulty because:

• To avoid storage duplication (or large transfers), the IPFS node has to run on download.kiwix.org
• The IPFS node will take a bit of time to read the whole file and compute the IPFS hash/URL

Therefore I believe the zimfarm-receiver Docker container which runs on download.kiwix.org should somehow require the IPFS-node Docker container to read/share the new ZIM file and then give back the IPFS URL.

Maybe we could achieve to get the ZIM file hashed at zimfarm-receiver demand and then been put online (sharing within the DHT network) one time the CMS decided to publish the file.