adjust runtime.GOMAXPROCS to match the container CPU quota, if any

go.mod

@@ -40,6 +40,7 @@ require (
 	github.com/stretchr/testify v1.6.1
 	github.com/studio-b12/gowebdav v0.0.0-20200303150724-9380631c29a1
 	go.etcd.io/bbolt v1.3.5
+	go.uber.org/automaxprocs v1.3.0
 	golang.org/x/crypto v0.0.0-20200820211705-5c72a883971a
 	golang.org/x/net v0.0.0-20200822124328-c89045814202
 	golang.org/x/sys v0.0.0-20200828194041-157a740278f4

go.sum

@@ -489,6 +489,8 @@ go.opencensus.io v0.22.4/go.mod h1:yxeiOL68Rb0Xd1ddK5vPZ/oVn4vY4Ynel7k9FzqtOIw=
 go.uber.org/atomic v1.3.2/go.mod h1:gD2HeocX3+yG+ygLZcrzQJaqmWj9AIm7n08wl/qW/PE=
 go.uber.org/atomic v1.4.0/go.mod h1:gD2HeocX3+yG+ygLZcrzQJaqmWj9AIm7n08wl/qW/PE=
 go.uber.org/atomic v1.5.0/go.mod h1:sABNBOSYdrvTF6hTgEIbc7YasKWGhgEQZyfxyTvoXHQ=
+go.uber.org/automaxprocs v1.3.0 h1:II28aZoGdaglS5vVNnspf28lnZpXScxtIozx1lAjdb0=
+go.uber.org/automaxprocs v1.3.0/go.mod h1:9CWT6lKIep8U41DDaPiH6eFscnTyjfTANNQNx6LrIcA=
 go.uber.org/multierr v1.1.0/go.mod h1:wR5kodmAFQ0UK8QlbwjlSNy0Z68gJhDJUG5sjR94q/0=
 go.uber.org/multierr v1.3.0/go.mod h1:VgVr7evmIr6uPjLBxg28wmKNXyqE9akIJ5XnfpiKl+4=
 go.uber.org/tools v0.0.0-20190618225709-2cfd321de3ee/go.mod h1:vJERXedbb3MVM5f9Ejo0C68/HhF8uaILCdgjnY+goOA=

main.go

@@ -3,8 +3,18 @@
 // https://github.com/drakkan/sftpgo/blob/master/README.md
 package main // import "github.com/drakkan/sftpgo"
 
-import "github.com/drakkan/sftpgo/cmd"
+import (
+	"fmt"
+
+	"go.uber.org/automaxprocs/maxprocs"
+
+	"github.com/drakkan/sftpgo/cmd"
+)
 
 func main() {
+	if undo, err := maxprocs.Set(); err != nil {
+		fmt.Printf("error setting max procs: %v\n", err)
+		undo()
+	}
 	cmd.Execute()
 }