nix: init caddy-custom

nix/packages/caddy/caddy-src/main.go

@@ -0,0 +1,23 @@
+// This file is copied from:
+// https://github.com/caddyserver/caddy/blob/82c356f2548ca62b75f76104bef44915482e8fd9/cmd/caddy/main.go#L21-L25
+
+//  1. Copy this file (main.go) into a new folder
+//  2. Edit the imports below to include the modules you want plugged in
+//  3. Run `go mod init caddy`
+//  4. Run `go install` or `go build` - you now have a custom binary!
+//
+// Or you can use xcaddy which does it all for you as a command:
+// https://github.com/caddyserver/xcaddy
+package main
+
+import (
+	caddycmd "github.com/caddyserver/caddy/v2/cmd"
+
+	// plug in Caddy modules here
+	_ "github.com/caddyserver/caddy/v2/modules/standard"
+	_ "github.com/jasonlovesdoggo/caddy-defender"
+)
+
+func main() {
+	caddycmd.Main()
+}