Add semi persistent vault

This is still just for testing, but gives the same
level of persistence, as does Kubo IPFS.

Done right, it should be safe, though. YMMV!

.gitignore

@@ -34,3 +34,4 @@ go.work
 /relay
 /node
 /.vault
+vault/**

cmd/pong/config.go

@@ -44,6 +44,7 @@ func p2pOptions() p2p.Options {
 			libp2p.DefaultSecurity,
 			libp2p.EnableRelay(),
 			libp2p.EnableRelayService(),
+			libp2p.Ping(true),
 		}}
 }
 

vault.hcl

@@ -0,0 +1,14 @@
+storage file {
+  path = "./vault"
+}
+
+listener tcp {
+  address = "127.0.0.1:8200"
+  tls_disable = 1
+}
+
+api_addr = "http://127.0.0.1:8200"
+
+default_lease_ttl = "168h"
+max_lease_ttl = "720h"
+ui = true