release: Bump to v22.0

[kylemanna]

• Update signing key and verification method as the hashes are now
  signed with many keys and fetching all of them seems overkill.

Closes #90

[kylemanna]

Looking for testers to build and confirm this works. Thanks!

[schildbach]

I just built the docker image, and checked the SHA-256 of /usr/local/bin/bitcoind within the image is 4aebceb3caf83f27bd3dd9030da637bacc836912a65a896860dc0252d0ebfad9. Then, I manually downloaded, verified and extracted Bitcoin Core 22.0 (x86_64-linux) from https://bitcoincore.org/en/download/ and its binary yields the same SHA-256.

I didn't actually run the docker image yet, except for a quick bitcoind --version smoke test.

[turcane]

When retrieving it from dockerhub it's still 21.0.
https://registry.hub.docker.com/r/kylemanna/bitcoind/tags?page=1&ordering=last_updated

[dasilvatek]

@kylemanna thank you, I have tested and confirm this Dockerfile is working - please commit #91 to master.

FYI @turcane this is how I tested:

1. git clone https://github.com/kylemanna/docker-bitcoind.git
2. cd docker-bitcoind/
3. wget https://raw.githubusercontent.com/kylemanna/docker-bitcoind/5e11a9f1e48017a8563eea495014f19310426883/Dockerfile
4. docker build -t kylemanna/bitcoind:dev .
5. docker run [....] --name bitcoin-node-dev kylemanna/bitcoind:dev
6. docker exec -it bitcoin-node-dev bash -l
7. sha256sum /usr/local/bin/bitcoind
   4aebceb3caf83f27bd3dd9030da637bacc836912a65a896860dc0252d0ebfad9 /usr/local/bin/bitcoind
8. bitcoin-cli getnetworkinfo
   "version": 220000,
   "subversion": "/Satoshi:22.0.0/",
   "protocolversion": 70016,
9. bitcoin-cli getblockchaininfo
   "chain": "main",
   "blocks": 709078,

[schildbach]

I've now run it for a couple of weeks, including the new feature I2P, and it seems to work fine from what I can tell.

[kylemanna]

Merged and pushed the updated image. Thanks all. LMK if you see any issues.