fix(pxc): raise haproxy conn limit (#732)

diff --git a/roles/defaults/vars.go b/roles/defaults/vars.go
new file mode 100644
index 0000000..07b3dc0
--- /dev/null
+++ b/roles/defaults/vars.go
@@ -0,0 +1,27 @@
+package defaults
+
+import (
+	"bytes"
+	_ "embed"
+
+	"github.com/goccy/go-yaml"
+)
+
+var (
+	//go:embed vars/main.yml
+	vars_file []byte
+)
+
+func GetImageByKey(key string) (string, error) {
+	path, err := yaml.PathString("$._atmosphere_images." + key)
+	if err != nil {
+		return "", err
+	}
+
+	var image string
+	if err := path.Read(bytes.NewReader(vars_file), &image); err != nil {
+		return "", err
+	}
+
+	return image, nil
+}