feat: add trigger to allow retrieving resource properties on the fly

plugins/resource/src/triggers/resource-get-property/resource-get-property.go

@@ -0,0 +1,26 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"os"
+
+	"github.com/dokku/dokku/plugins/common"
+	"github.com/dokku/dokku/plugins/resource"
+)
+
+// writes the resource property to stdout for a given app container
+func main() {
+	flag.Parse()
+	appName := flag.Arg(0)
+	procType := flag.Arg(1)
+	resourceType := flag.Arg(1)
+	property := flag.Arg(1)
+
+	value, err := resource.GetResourceValue(appName, procType, resourceType, property)
+	if err != nil {
+		common.LogFail(err.Error())
+	}
+
+	fmt.Fprintln(os.Stdout, value)
+}