alembic merge ignores revision_environment and cannot find the hooks defined in env.py

[FeeeeK]

Describe the bug
As title says, alembic merge ignores revision_environment and cannot find the hooks defined in env.py.

Expected behavior
Custom hooks work the way they do when generating revisions

To Reproduce

# alembic.ini
revision_environment = true
hooks = ruff
ruff.type = ruff
ruff.options = --select I --select F401 --fix

# env.py
from alembic.script import write_hooks

@write_hooks.register("ruff")
def run_ruff(filename, options):
    ruff = os.path.join(sysconfig.get_path("scripts"), "ruff")
    os.system(f"{ruff} {options['options']} {filename}")  # noqa: S605

Error

Running post write hook 'ruff' ...
  FAILED
FAILED: No formatter with name 'ruff' registered.

Versions.

• Python: 3.11.1
• Alembic: 1.11.3

Additional context
For the ruff example, this may become useless after #1276, but it is still needed for the rest of the custom hooks .

Have a nice day!
Thanks, you too!

[sqla-tester]

Mike Bayer has proposed a fix for this issue in the main branch:

implement revision_environment for merge https://gerrit.sqlalchemy.org/c/sqlalchemy/alembic/+/4817

[zzzeek]

thanks for reporting