Discrete (XDS) pool miner v5 - 5.0.0 - Linux x64

1. Put your XDS payout address (disc1...) in address.txt, nothing else.
2. Run ./start.sh. The worker name is the host name.
   Needs glibc 2.35 or newer (Ubuntu 22.04, Debian 12 or later).

The miner gets a temporary signing key from the pool and signs locally;
it never needs your wallet, seed or spend key. Rewards are paid to address.txt.

v5 - miner secret: on first start the miner creates miner-secret.key next to
the program (32 random bytes). The pool derives your signing key from it, so
nobody can obtain your key just by knowing your address and worker name.
Keep the file. If you lose it nothing is lost: the miner makes a new one and
the pool gives you a new key; balances belong to your address, not to the file.
Do not share it. To keep it elsewhere: --secret-file PATH.
Miners older than v5 are refused after the date shown on the pool page.
