Use Ubser's maxproc to treat CPU quotas

go.mod

@@ -22,6 +22,7 @@ require (
 	github.com/prometheus/client_golang v1.11.0
 	github.com/sirupsen/logrus v1.8.1
 	github.com/stretchr/testify v1.7.0
+	go.uber.org/automaxprocs v1.4.0 // indirect
 	golang.org/x/image v0.0.0-20201208152932-35266b937fa6
 	golang.org/x/net v0.0.0-20210503060351-7fd8e65b6420
 	golang.org/x/sys v0.0.0-20210603125802-9665404d3644

go.sum

@@ -447,6 +447,8 @@ go.opencensus.io v0.22.4/go.mod h1:yxeiOL68Rb0Xd1ddK5vPZ/oVn4vY4Ynel7k9FzqtOIw=
 go.opencensus.io v0.22.5/go.mod h1:5pWMHQbX5EPX2/62yrJeAkowc+lfs/XD7Uxpq3pI6kk=
 go.opencensus.io v0.23.0 h1:gqCw0LfLxScz8irSi8exQc7fyQ0fKQU/qnC/X8+V/1M=
 go.opencensus.io v0.23.0/go.mod h1:XItmlyltB5F7CS4xOC1DcqMoFqwtC6OG2xF7mCv7P7E=
+go.uber.org/automaxprocs v1.4.0 h1:CpDZl6aOlLhReez+8S3eEotD7Jx0Os++lemPlMULQP0=
+go.uber.org/automaxprocs v1.4.0/go.mod h1:/mTEdr7LvHhs0v7mjdxDreTz1OG5zdZGqgOnhWiR/+Q=
 golang.org/x/crypto v0.0.0-20180904163835-0709b304e793/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
 golang.org/x/crypto v0.0.0-20181203042331-505ab145d0a9/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=

main.go

@@ -9,6 +9,7 @@ import (
 	"time"
 
 	log "github.com/sirupsen/logrus"
+	"go.uber.org/automaxprocs/maxprocs"
 
 	"github.com/imgproxy/imgproxy/v3/config"
 	"github.com/imgproxy/imgproxy/v3/errorreport"
@@ -27,6 +28,8 @@ func initialize() error {
 		return err
 	}
 
+	maxprocs.Set(maxprocs.Logger(log.Debugf))
+
 	if err := config.Configure(); err != nil {
 		return err
 	}