feat: add initial implementation of osiris, the TLS terminator for Anubis

Signed-off-by: Xe Iaso <me@xeiaso.net>

cmd/osiris/main.go

@@ -0,0 +1,37 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"os"
+
+	"github.com/TecharoHQ/anubis"
+	"github.com/TecharoHQ/anubis/cmd/osiris/internal/entrypoint"
+	"github.com/TecharoHQ/anubis/internal"
+	"github.com/facebookgo/flagenv"
+)
+
+var (
+	configFname = flag.String("config", "./osiris.hcl", "Configuration file (HCL), see docs")
+	slogLevel   = flag.String("slog-level", "INFO", "logging level (see https://pkg.go.dev/log/slog#hdr-Levels)")
+	versionFlag = flag.Bool("version", false, "if true, show version information then quit")
+)
+
+func main() {
+	flagenv.Parse()
+	flag.Parse()
+
+	if *versionFlag {
+		fmt.Println("Osiris", anubis.Version)
+		return
+	}
+
+	internal.InitSlog(*slogLevel)
+
+	if err := entrypoint.Main(entrypoint.Options{
+		ConfigFname: *configFname,
+	}); err != nil {
+		fmt.Fprintf(os.Stderr, "%v\n", err)
+		os.Exit(1)
+	}
+}