Update CI configs to v0.2.1

[pionbot]

Update lint scripts and CI configs.

[Sean-Der]

@adwpc @cloudwebrtc I am going to work on fixing linting issues, if you disagree we can disable this! I don't own Ion so I don't want to make any of the decisions, but some of these are valid errors.

pkg/discovery/node.go:14:2: `name` is unused (structcheck)
        name string
        ^
pkg/rtc/router.go:35:2: `id` is unused (structcheck)
        id string
        ^
pkg/rtc/plugins/buffer.go:58:2: `byteRate` is unused (structcheck)
        byteRate  uint64
        ^
pkg/node/islb/init.go:12:2: `redisKeyTTL` is unused (varcheck)
        redisKeyTTL     = 1500 * time.Millisecond
        ^
ERRO [runner/typecheck] typechecking error: pkg/type/type.go:1:9: expected 'IDENT', found 'type'
pkg/signal/room.go:39:6: `delRoom` is unused (deadcode)
func delRoom(id string) {
     ^
pkg/signal/peer.go:15:6: `getPeer` is unused (deadcode)
func getPeer(rid, id string) *peer.Peer {
     ^
pkg/rtc/router.go:34:6: `rtcpInfo` is unused (deadcode)
type rtcpInfo struct {
     ^
pkg/node/sfu/internal.go:249:6: `trickle` is unused (deadcode)
func trickle(msg map[string]interface{}) (map[string]interface{}, *nprotoo.Error) {
     ^
pkg/discovery/node_test.go:18:2: `nodes` is unused (deadcode)
        nodes []Node
        ^
pkg/node/biz/util.go:10:6: `getMID` is unused (deadcode)
func getMID(uid string) string {
     ^
pkg/node/biz/util.go:14:6: `getKeepAliveID` is unused (deadcode)
func getKeepAliveID(mid string, ssrc uint32) string {
     ^
pkg/node/biz/code.go:3:6: `code` is unused (deadcode)
type code int
     ^
cmd/biz/main.go:29:23: Error return value of `http.ListenAndServe` is not checked (errcheck)
                        http.ListenAndServe(conf.Global.Pprof, nil)
                                           ^
cmd/islb/main.go:24:23: Error return value of `http.ListenAndServe` is not checked (errcheck)
                        http.ListenAndServe(conf.Global.Pprof, nil)
                                           ^
cmd/sfu/main.go:34:23: Error return value of `http.ListenAndServe` is not checked (errcheck)
                        http.ListenAndServe(conf.Global.Pprof, nil)
                                           ^
pkg/db/redis_test.go:49:9: Error return value of `db.HSet` is not checked (errcheck)
        db.HSet(mkey, field, value)
               ^
pkg/db/redis_test.go:57:9: Error return value of `db.HSet` is not checked (errcheck)
        db.HSet(mkey, field, value)
               ^
pkg/db/redis_test.go:64:9: Error return value of `db.HSet` is not checked (errcheck)
        db.HSet(mkey, field, value)
               ^
pkg/discovery/discovery.go:44:12: Error return value of `etcd.keep` is not checked (errcheck)
                etcd.keep(etcdNode, "")
                         ^
pkg/discovery/discovery.go:50:16: Error return value of `etcd.update` is not checked (errcheck)
                                etcd.update(etcdNode, getScore())
                                           ^
pkg/discovery/discovery.go:100:12: Error return value of `etcd.keep` is not checked (errcheck)
                etcd.keep(key, val)
                         ^
pkg/discovery/discovery.go:106:13: Error return value of `etcd.watch` is not checked (errcheck)
                etcd.watch(key, watchFunc, prefix)

[adwpc]

@Sean-Der Great work！I have considered CI before！This can make code better and reduce bugs！

[Sean-Der]

@adwpc ok cool I will roll forward with this, just wanted to check first this is something you agree with :)

[cloudwebrtc]

@Sean-Der Fully agree, even we can add CI for JS and Flutter to avoid errors.

[at-wat]

@Sean-Der I suppose this repo don't need WASM test.
We'll be better to have pion/.goassets#21.

[at-wat]

I'm going to update the CI script to load a config file and make it possible to skip WASM test according to the config.
pion/.goassets#26