add riscv64 release

[mengzhuo]

No description provided.

[slingamn]

Thanks for your interest in the project! I'm not sure RISC-V actually has the adoption to justify this change yet. I would guess anyone running RISC-V is comfortable building from source as per our instructions?

Just curious, have you been running Ergo on a RISC-V machine? What was your experience like?

[mengzhuo]

Yes, I can run ergo flawless on RISC-V machine

# uname -a
Linux visionfive2-1 5.15.0-starfive #1 SMP Sun Jun 11 07:48:39 UTC 2023 riscv64 GNU/Linux
# go version
go version go1.22.3 linux/riscv64
# go build .
# ./ergo --help
ergo.
Usage:
        ergo initdb [--conf <filename>] [--quiet]
        ergo upgradedb [--conf <filename>] [--quiet]
        ergo importdb <database.json> [--conf <filename>] [--quiet]
        ergo genpasswd [--conf <filename>] [--quiet]
        ergo mkcerts [--conf <filename>] [--quiet]
        ergo defaultconfig
        ergo run [--conf <filename>] [--quiet] [--smoke]
        ergo -h | --help
        ergo --version
Options:
        --conf <filename>  Configuration file to use [default: ircd.yaml].
        --quiet            Don't show startup/shutdown lines.
        -h --help          Show this screen.
        --version          Show version.

# ./ergo mkcerts && ./ergo run
2024/06/18 01:39:00 making self-signed certificates
2024/06/18 01:39:00  making cert for :6697 listener
2024/06/18 01:39:01   Certificate created at fullchain.pem : privkey.pem
2024-06-18T01:39:01.682Z : info  : server     : ergo-2.14.0-rc2 starting
2024-06-18T01:39:01.682Z : info  : server     : Using config file : ircd.yaml
2024-06-18T01:39:01.683Z : info  : server     : Using datastore : ircd.db
2024-06-18T01:39:01.683Z : warn  : server     : database does not exist, creating it : ircd.db
2024-06-18T01:39:01.686Z : info  : server     : Proxied IPs will be accepted from : localhost
2024-06-18T01:39:01.686Z : info  : listeners  : now listening on 127.0.0.1:6667, tls=false, proxy=false, tor=false, websocket=false.
2024-06-18T01:39:01.686Z : info  : listeners  : now listening on [::1]:6667, tls=false, proxy=false, tor=false, websocket=false.
2024-06-18T01:39:01.687Z : info  : listeners  : now listening on :6697, tls=true, proxy=false, tor=false, websocket=false.
2024-06-18T01:39:01.687Z : info  : server     : Server running

[slingamn]

I merged a modified version of this as #2173