feat(justfile): add apt_cache_sharing argument to avoid buildah bug

There are bugs with cache sharing in buildah when using a locked
strategy, so avoid doing that on podman by default (overridable).

Author: unleashed

justfile

@@ -26,6 +26,13 @@ podman_remote := if _docker_bin_name == 'podman' {
     'false'
 }
 
+# apt cache sharing mode hits a bug in buildah
+_apt_cache_sharing := if _docker_bin_name == 'podman' {
+    ''
+} else {
+    ',sharing=locked'
+}
+
 targets := 'go rust rust-musl tools devcontainer'
 
 load := 'false'
@@ -154,6 +161,7 @@ _build *args='':
         --progress='{{ DOCKER_PROGRESS }}' \
         {{ output }} \
         {{ if docker_arch != '' { '--platform=' + docker_arch } else { '' } }} \
+        --build-arg APT_CACHE_SHARING={{ _apt_cache_sharing }} \
         {{ args }}"
 
     echo "{{ style('error') }}$cmd{{ NORMAL }}"