Use goreleaser to build and release (#244)

Instead of using gox on one side and an action to release, we can merge
them together with goreleaser which will build for extra targets (arm,
mips if needed in the future) and it also takes care of creating
checksums, a source archive, and a changelog and creating a release with
all the artifacts.

All binaries should respect the old naming convention, so any scripts
out there should still work.

Signed-off-by: Itxaka <igarcia@suse.com>

vendor/google.golang.org/grpc/internal/syscall/syscall_nonlinux.go

@@ -18,6 +18,8 @@
  *
  */
 
+// Package syscall provides functionalities that grpc uses to get low-level
+// operating system stats/info.
 package syscall
 
 import (
@@ -29,10 +31,11 @@ import (
 )
 
 var once sync.Once
+var logger = grpclog.Component("core")
 
 func log() {
 	once.Do(func() {
-		grpclog.Info("CPU time info is unavailable on non-linux or appengine environment.")
+		logger.Info("CPU time info is unavailable on non-linux or appengine environment.")
 	})
 }
 
@@ -47,7 +50,7 @@ func GetCPUTime() int64 {
 type Rusage struct{}
 
 // GetRusage is a no-op function under non-linux or appengine environment.
-func GetRusage() (rusage *Rusage) {
+func GetRusage() *Rusage {
 	log()
 	return nil
 }