Use base Docker image from ghcr.io

docker/Dockerfile

@@ -1,6 +1,6 @@
 ARG BASE_IMAGE_VERSION="v3.12.0"
 
-FROM darthsim/imgproxy-base:${BASE_IMAGE_VERSION} AS build
+FROM ghcr.io/imgproxy/imgproxy-base:${BASE_IMAGE_VERSION} AS build
 
 ENV CGO_ENABLED=1