Add --dirty to git describe

tox.ini

@@ -23,15 +23,15 @@ allowlist_externals =
     {[testenv]allowlist_externals}
     charmcraft
     mv
-    cp
 commands_pre =
-    poetry export --only main,charm-libs --output requirements.txt
     # Workaround to add unique identifier (git hash) to charm version while specification
     # DA053 - Charm versioning
     # (https://docs.google.com/document/d/1Jv1jhWLl8ejK3iJn7Q3VbCIM9GIhp8926bgXpdtx-Sg/edit?pli=1)
     # is pending review.
     cp charm_version charm_version.backup
-    python -c 'import pathlib; import subprocess; file = pathlib.Path("charm_version"); version = file.read_text().strip(); git_hash=subprocess.run(["git", "describe", "--always"], capture_output=True, check=True, encoding="utf-8").stdout; file.write_text(f"{version}+{git_hash}")'
+    python -c 'import pathlib; import shutil; import subprocess; git_hash=subprocess.run(["git", "describe", "--always", "--dirty"], capture_output=True, check=True, encoding="utf-8").stdout; file = pathlib.Path("charm_version"); shutil.copy(file, pathlib.Path("charm_version.backup")); version = file.read_text().strip(); file.write_text(f"{version}+{git_hash}")'
+
+    poetry export --only main,charm-libs --output requirements.txt
 commands =
     build: charmcraft pack {posargs}
 commands_post =