feat: add Dockerfile and GitHub Actions workflow for building and publishing Docker image

.dockerignore

@@ -0,0 +1,62 @@
+# Logs and temporary files
+
+Logs/
+logs/
+temp/
+\*.log
+
+# Sensitive files
+
+key_vault.db
+unshackle/WVDs/
+unshackle/PRDs/
+unshackle/cookies/
+_.prd
+_.wvd
+
+# Cache directories
+
+unshackle/cache/
+**pycache**/
+_.pyc
+_.pyo
+\*.pyd
+.Python
+
+# Development files
+
+.git/
+.gitignore
+.vscode/
+.idea/
+_.swp
+_.swo
+
+# Documentation and plans
+
+plan/
+CONTRIBUTING.md
+CONFIG.md
+AGENTS.md
+OLD-CHANGELOG.md
+cliff.toml
+
+# Installation scripts
+
+install.bat
+
+# Test files
+
+_test_
+_Test_
+
+# Virtual environments
+
+venv/
+env/
+.venv/
+
+# OS generated files
+
+.DS_Store
+Thumbs.db