enhance: Add comprehensive .gitignore for deb-mock project

- Add mock-specific build artifacts (chroot/, mock-*, mockroot/)
- Include package build files (*.deb, *.changes, *.buildinfo)
- Add development tools (.coverage, .pytest_cache, .tox)
- Include system files (.DS_Store, Thumbs.db, ._*)
- Add temporary and backup files (*.tmp, *.bak, *.backup)
- Include local configuration overrides (config.local.yaml, .env.local)
- Add test artifacts and documentation builds
- Comprehensive coverage for Python build system project

This ensures build artifacts, chroot environments, and development
tools are properly ignored in version control.

docs/Plugin-Tmpfs.md

@@ -0,0 +1,25 @@
+---
+layout: default
+title: Plugin TmpFS
+---
+
+The TmpFS plugin allows you to mount a tmpfs on the chroot dir. This plugin is disabled by default.
+
+## Configuration
+
+You can enable the plugin using this settings:
+```python
+config_opts['plugin_conf']['tmpfs_enable'] = True
+config_opts['plugin_conf']['tmpfs_opts'] = {}
+config_opts['plugin_conf']['tmpfs_opts']['required_ram_mb'] = 1024
+config_opts['plugin_conf']['tmpfs_opts']['max_fs_size'] = '768m'
+config_opts['plugin_conf']['tmpfs_opts']['mode'] = '0755'
+config_opts['plugin_conf']['tmpfs_opts']['keep_mounted'] = False
+```
+
+* `required_ram_mb` - If system has less memory than this value, the TmpFS plugin will be disabled and a warning is omitted, but `mock` will continue.
+* `max_fs_size` - this is passed to `mount.tmpfs` as `-o size=X`
+* `mode` - this is passed to to `mount.tmpfs` as `-o mode=X`
+* `keep_mounted` - when set to `True`, the `buildroot` is not unmounted when mock exits (which will destroy it's content). Additionally when mock is starting and it detects the tmpfs from a previous run, it will reuse it.
+
+:warning: You can not combine **Tmpfs plugin** and **Lvm_root plugin**, because it is not possible to mount Logical Volume as tmpfs.