By default, `go install` will install go $GOBIN and not $GOPATH/bin. In
most cases there is no functional difference -- `go install` falls
back to $GOPATH/bin when $GOBIN is empty.

ci: remove disabled testground workflow

docs: add bifrost to early testers

fix: t0116-gateway-cache.sh

This does nothing, just move from an untagged commit to a tagged commit but contain the same things.

This routing type is the same as "auto" but it creates the DHT in
"client" mode and hence does not start a DHT server.

This commit replaces `os.MkdirTemp` with `t.TempDir` in tests. The
directory created by `t.TempDir` is automatically removed when the test
and all its subtests complete.

Prior to this commit, temporary directory created using `os.MkdirTemp`
needs to be removed manually by calling `os.RemoveAll`, which is omitted
in some tests. The error handling boilerplate e.g.
	defer func() {
		if err := os.RemoveAll(dir); err != nil {
			t.Fatal(err)
		}
	}
is also tedious, but `t.TempDir` handles this for us nicely.

Reference: https://pkg.go.dev/testing#T.TempDir
Signed-off-by: Eng Zer Jun <engzerjun@gmail.com>

This is the slowest test in the sharness test suite, because it has
very long sleeps. It usually takes 2+ minutes to run.

This new impl runs all peering tests in about 20 seconds, since it
polls for conditions instead of sleeping, and runs the tests in
parallel.

This also has an additional test case for a peer that was never online
and then connects.

Fixes #9717

Fixes #9695

docs: 0.19 changelog

Release: v0.19.0