Re-deploy the foundation's DNS seeders for NU5 testnet

[teor2345]

See #1841 for details.

Tasks

After we merge #2796 and #2808, we need to:

• Deploy a new DNS seeder instance for NU5 testnet (170014), but don't switch the Foundation's DNS records yet
  • failed deployment https://github.com/ZcashFoundation/coredns-zcash/actions/runs/1267893660
  • fix PRs:
    • Create a dependabot.yml to update GitHub actions coredns-zcash#9
    • Use google-github-actions/setup-gcloud coredns-zcash#10
  • successful deployment: https://github.com/ZcashFoundation/coredns-zcash/runs/3703970205
• Deploy a new DNS seeder instance for NU5 testnet (170015), but don't switch the Foundation's DNS records yet
  • Change the max network protocol version in the DNS seeder to 170_015 for NU5 testnet #2808
  • Set network protocol version to NU5 testnet (second activation) dnsseeder#13
  • https://github.com/ZcashFoundation/coredns-zcash/actions/runs/1288695743
• Check that the testnet seeder is returning new peers
• Check that the mainnet seeder continues to return current peers
• Switch the Foundation's DNS records to point to the new instance

[dconnolly]

Deployed new seeder:

https://github.com/ZcashFoundation/coredns-zcash/actions/runs/1271133091

[teor2345]

Here are the default mainnet and testnet DNS seeders:

zebra/zebra-network/src/config.rs

Lines 161 to 176 in b42ab67

	fn default() -> Config {
	let mainnet_peers = [
	"dnsseed.z.cash:8233",
	"dnsseed.str4d.xyz:8233",
	"mainnet.seeder.zfnd.org:8233",
	"mainnet.is.yolo.money:8233",
	]
	.iter()
	.map(|&s| String::from(s))
	.collect();
	let testnet_peers = [
	"dnsseed.testnet.z.cash:18233",
	"testnet.seeder.zfnd.org:18233",
	"testnet.is.yolo.money:18233",
	]

[teor2345]

Currently the testnet seeders are returning:

• new ZFND - 3 nodes
• ZFND - 5 nodes
• YOLO - 9 nodes
• ECC - 3 nodes

There are some common node addresses across the seeders.

dig dnsseed.testnet.z.cash
dig @34.72.199.73 testnet.seeder.zfnd.org
dig testnet.is.yolo.money
dig testnet.seeder.zfnd.org

[teor2345]

Currently the mainnet seeders are returning:

• ZFND - 21 nodes
• new ZFND - 16 nodes
• YOLO - 25 nodes
• ECC - 25 nodes
• STR4D - 25 nodes

Given the number of nodes on mainnet, we don't expect common node addresses across the seeders.

dig mainnet.seeder.zfnd.org
dig @34.72.199.73 mainnet.seeder.zfnd.org
dig mainnet.is.yolo.money
dig dnsseed.z.cash
dig dnsseed.str4d.xyz

[mpguerra]

Hey team! Please add your planning poker estimate with ZenHub @conradoplg @dconnolly @jvff @oxarbitrage @teor2345 @upbqdn

[teor2345]

The ZFND mainnet seeder is now returning up-to-date peers, except for a few outdated peers, due to a known bug:

• Enforce the minimum protocol version dnsseeder#10

[teor2345]

The ZFND testnet seeder is now returning up-to-date peers: