feat: default config file location

Construct a default config file location from yggdrasil constants.

main.go

@@ -6,6 +6,7 @@ import (
 	"fmt"
 	"net"
 	"os"
+	"path/filepath"
 	"strconv"
 	"strings"
 	"time"
@@ -14,14 +15,15 @@ import (
 
 	"github.com/peterbourgon/ff/v3"
 	"github.com/peterbourgon/ff/v3/fftoml"
+	"github.com/redhatinsights/yggdrasil"
 	pb "github.com/redhatinsights/yggdrasil/protocol"
 	"github.com/sgreben/flagvar"
 	"github.com/zcalusic/sysinfo"
 	"google.golang.org/grpc"
 )
 
 func main() {
-	fs := flag.NewFlagSet("yggd-package-manager-worker", flag.ExitOnError)
+	fs := flag.NewFlagSet(filepath.Base(os.Args[0]), flag.ExitOnError)
 
 	var (
 		socketAddr    = ""
@@ -32,7 +34,7 @@ func main() {
 	fs.StringVar(&socketAddr, "socket-addr", "", "dispatcher socket address")
 	fs.Var(&logLevel, "log-level", "log verbosity level (error (default), warn, info, debug, trace)")
 	fs.Var(&allowPatterns, "allow-pattern", "regular expression pattern to allow package operations\n(can be specified multiple times)")
-	_ = fs.String("config", "", "path to `file` containing configuration values (optional)")
+	_ = fs.String("config", filepath.Join(yggdrasil.SysconfDir, yggdrasil.LongName, "workers", fs.Name()+".toml"), "path to `file` containing configuration values (optional)")
 
 	ff.Parse(fs, os.Args[1:], ff.WithEnvVarPrefix("YGG"), ff.WithConfigFileFlag("config"), ff.WithConfigFileParser(fftoml.Parser))