Add current sha256 hash to ubuntu base image

utils/multires/Dockerfile

@@ -1,6 +1,6 @@
 # syntax=docker/dockerfile:1
 
-FROM ubuntu:24.04
+FROM ubuntu:24.04@sha256:3f85b7caad41a95462cf5b787d8a04604c8262cdcdf9a472b8c52ef83375fe15
 
 # docker build -t generate-panorama .
 # docker run -it -v $PWD:/data generate-panorama /data/image.jpg