feat: port builder :report subcommands to golang

The bash :report implementations for the dockerfile, herokuish, lambda, nixpacks, pack, and railpack builders are replaced with a compiled golang binary that collects report keys in parallel and marshals json directly, avoiding the per-key subshell and jq forks that made the bash reports slow. The subcommands/report and root report trigger become symlinks to the compiled binary, while the non-report bash helpers each plugin still relies on are left in place.

plugins/builder-lambda/src/triggers/triggers.go

@@ -0,0 +1,31 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"os"
+	"strings"
+
+	builderlambda "github.com/dokku/dokku/plugins/builder-lambda"
+	"github.com/dokku/dokku/plugins/common"
+)
+
+// main entrypoint to all triggers
+func main() {
+	parts := strings.Split(os.Args[0], "/")
+	trigger := parts[len(parts)-1]
+	flag.Parse()
+
+	var err error
+	switch trigger {
+	case "report":
+		appName := flag.Arg(0)
+		err = builderlambda.ReportSingleApp(appName, "", "")
+	default:
+		err = fmt.Errorf("Invalid plugin trigger call: %s", trigger)
+	}
+
+	if err != nil {
+		common.LogFailWithError(err)
+	}
+}