Fix ltex Docker image loading with buildx docker-container driver (#9)

Add --load flag to docker build command to ensure the built image is
exported to the local Docker image store, not just kept in the build
cache.

This fixes compatibility with Podman Desktop and Docker setups using
the docker-container buildx driver, where docker build is aliased to
docker buildx build and requires explicit --load to make images
available for docker run.

Without this flag, the build succeeds but the image remains only in
the BuildKit cache, causing "Unable to find image" errors when the
hook tries to run the container.

Author: matthieu-gendreau

ltex/ltex.sh

@@ -12,7 +12,7 @@ ltex_version="ltex:$ltex_tag"
 
 (
   cd "$ltex_dir"
-  docker inspect "$ltex_version" &>/dev/null || docker build . -t "$ltex_version" -t 'ltex:latest' > /dev/null
+  docker inspect "$ltex_version" &>/dev/null || docker build --load . -t "$ltex_version" -t 'ltex:latest' > /dev/null
 )
 
 files_to_clean=()