Fix env missing from non-building WheelhouseTactic

[himax16]

Fix the recent changes for WheelhouseTactic failing on non-building state

Checklist

• Are all your commits [logically] grouped and squashed appropriately?
• Does this patch have code coverage?
• Does your code pass make test?

[freyes]

LGTM,. waiting for CI

[freyes]

The ci failure has no relation to this change. I'm merging this patch as it is to fix charm-tools , although we'll need fix the CI too

::                           File "/tmp/tmpvkesiw0w/lib/python3.12/site-packages/pip/_internal/operations/prepare.py", line 76, in _get_prepared_distribution
::                             with build_tracker.track(req, tracker_id):
::                           File "/usr/lib/python3.12/contextlib.py", line 137, in __enter__
::                             return next(self.gen)
::                                    ^^^^^^^^^^^^^^
::                           File "/tmp/tmpvkesiw0w/lib/python3.12/site-packages/pip/_internal/operations/build/build_tracker.py", line 138, in track
::                             self.add(req, tracker_id)
::                           File "/tmp/tmpvkesiw0w/lib/python3.12/site-packages/pip/_internal/operations/build/build_tracker.py", line 104, in add
::                             raise LookupError(message)
::                         LookupError: https://files.pythonhosted.org/packages/be/ec/855654011b4b02037c7c56c4678c02934ed218dd218ba1b0c74ada6ada3b/setuptools_scm-10.0.3.tar.gz (from https://pypi.org/simple/setuptools-scm/) (requires-python:>=3.10) is already being built: setuptools-scm>=7 from https://files.pythonhosted.org/packages/be/ec/855654011b4b02037c7c56c4678c02934ed218dd218ba1b0c74ada6ada3b/setuptools_scm-10.0.3.tar.gz (from -r /tmp/tmpb7lddsf7/wheelhouse.txt (line 35))
::                         [end of output]
::