chore: remove govalidator lib usage

Replace with a single regex

go.mod

@@ -4,7 +4,6 @@ go 1.20
 
 require (
 	github.com/aholic/ggtimer v0.0.0-20150905131044-5d7b30837a52
-	github.com/asaskevich/govalidator v0.0.0-20230301143203-a9d515a09cc2
 	github.com/avast/retry-go/v4 v4.5.1
 	github.com/chobie/go-gaussian v0.0.0-20150107165016-53c09d90eeaf
 	github.com/evalphobia/logrus_fluent v0.5.4

go.sum

@@ -1,7 +1,5 @@
 github.com/aholic/ggtimer v0.0.0-20150905131044-5d7b30837a52 h1:PuAAatjhSeWL+ybYPp3eAZ88we2mHZ/b4l/YUzIwpAw=
 github.com/aholic/ggtimer v0.0.0-20150905131044-5d7b30837a52/go.mod h1:dn/mVOaud2SCQOekwuqMOnheqP2Cu3cCYe/pN3TWNPA=
-github.com/asaskevich/govalidator v0.0.0-20230301143203-a9d515a09cc2 h1:DklsrG3dyBCFEj5IhUbnKptjxatkF07cF2ak3yi77so=
-github.com/asaskevich/govalidator v0.0.0-20230301143203-a9d515a09cc2/go.mod h1:WaHUgvxTVq04UNunO+XhnAqY/wQc+bxr74GqbsZ/Jqw=
 github.com/avast/retry-go/v4 v4.5.1 h1:AxIx0HGi4VZ3I02jr78j5lZ3M6x1E0Ivxa6b0pUUh7o=
 github.com/avast/retry-go/v4 v4.5.1/go.mod h1:/sipNsvNB3RRuT5iNcb6h73nw3IBmXJ/H3XrCQYSOpc=
 github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=

internal/trigger/rate/rate.go

@@ -2,11 +2,10 @@ package rate
 
 import (
 	"fmt"
+	"regexp"
 	"strconv"
 	"strings"
 	"time"
-
-	"github.com/asaskevich/govalidator"
 )
 
 func ParseRate(rateArg string) (int, time.Duration, error) {
@@ -23,7 +22,7 @@ func ParseRate(rateArg string) (int, time.Duration, error) {
 			return rate, unit, fmt.Errorf("invalid rate arg %s", rateArg)
 		}
 		unitArg := (rateArg)[strings.Index(rateArg, "/")+1:]
-		if !govalidator.IsNumeric(unitArg[0:1]) {
+		if !isNumeric(unitArg[0:1]) {
 			unitArg = "1" + unitArg
 		}
 		unit, err = time.ParseDuration(unitArg)
@@ -44,3 +43,8 @@ func ParseRate(rateArg string) (int, time.Duration, error) {
 
 	return rate, unit, nil
 }
+
+func isNumeric(value string) bool {
+	re := regexp.MustCompile("^[0-9]+$")
+	return re.MatchString(value)
+}