Add docker buildkit flag (#6219)

* chore: add docker buildkit flag

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

hooks/post_gen_project.py

@@ -1,5 +1,6 @@
 # ruff: noqa: PLR0133
 import json
+import os
 import random
 import shutil
 import string
@@ -532,6 +533,10 @@ def setup_dependencies():
                     ".",
                 ],
                 check=True,
+                env={
+                    **os.environ,
+                    "DOCKER_BUILDKIT": "1",
+                },
             )
         except subprocess.CalledProcessError as e:
             print(f"Error building Docker image: {e}", file=sys.stderr)