feat: add more log statements

* umu_run: log version

* umu_run: log host environment variables

* umu_run: log python version info

umu/umu_run.py

@@ -30,6 +30,7 @@
 from Xlib.protocol.rq import Event
 from Xlib.xobject.drawable import Window
 
+from umu import __version__
 from umu.umu_consts import (
     PR_SET_CHILD_SUBREAPER,
     PROTON_VERBS,
@@ -725,6 +726,10 @@ def main() -> int:  # noqa: D103
         console_handler.setFormatter(CustomFormatter(DEBUG))
         log.addHandler(console_handler)
         log.setLevel(level=DEBUG)
+        for key, val in os.environ.items():
+            log.debug("%s=%s", key, val)
+
+    log.console(f"umu-launcher version {__version__} ({sys.version})")
 
     with ThreadPoolExecutor() as thread_pool:
         try: