feat: define needed environment variables in static-builder.Dockerfile (#338)

static-builder.Dockerfile

@@ -2,9 +2,17 @@
 FROM golang-base
 
 ARG FRANKENPHP_VERSION=''
+ENV FRANKENPHP_VERSION=${FRANKENPHP_VERSION}
+
 ARG PHP_VERSION=''
+ENV PHP_VERSION=${PHP_VERSION}
+
 ARG PHP_EXTENSIONS=''
+ENV PHP_EXTENSIONS=${PHP_EXTENSIONS}
+
 ARG PHP_EXTENSION_LIBS=''
+ENV PHP_EXTENSION_LIBS=${PHP_EXTENSION_LIBS}
+
 ARG CLEAN=''
 ARG EMBED=''
 SHELL ["/bin/ash", "-eo", "pipefail", "-c"]