feat(docker): enhance Dockerfile and entrypoint script with improved debugging outputs; update .dockerignore for better file management

.dockerignore

@@ -1,6 +1,7 @@
 # Version control
 .git
 .gitignore
+.gitattributes
 
 # Python
 __pycache__/
@@ -8,6 +9,7 @@ __pycache__/
 *$py.class
 *.so
 .Python
+venv/
 env/
 build/
 develop-eggs/
@@ -20,25 +22,44 @@ lib64/
 parts/
 sdist/
 var/
+wheels/
 *.egg-info/
 .installed.cfg
 *.egg
-
-# Virtual environments
-venv/
-ENV/
-.env
+MANIFEST
 
 # IDE
 .idea/
 .vscode/
 *.swp
 *.swo
+.project
+.pydevproject
+.settings/
+*.sublime-workspace
+*.sublime-project
 
 # Test
 .pytest_cache/
 .coverage
 htmlcov/
+.tox/
+.nox/
+coverage.xml
+*.cover
+*.py,cover
+.hypothesis/
 
 # Project specific
-rules_backup/
+rules_backup/
+.env
+
+# Keep these files
+!src/
+!src/simpleguardhome/
+!requirements.txt
+!setup.py
+!pyproject.toml
+!MANIFEST.in
+!LICENSE
+!README.md