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/Release-Notes-1.2.14.md

@@ -0,0 +1,12 @@
+---
+layout: default
+title: Release Notes 1.2.14
+---
+
+mock-1.2.14 is bugfix release, but some bugfix may be interesting for you:
+
+* --new-chroot now works on rhel7
+* create tmpfs with unlimited inodes [RHBZ#1266453](http://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=1266453) - otherwise architectures with large pages (e.g. PPC64) can use only fraction of the tmpfs capacity.
+* Add %(resultdir) placeholder for sign plugin. [RHBZ#1272123](http://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=1272123)
+* use --setopt=deltarpm=false as default value for dnf_common_opts [RHBZ#1281355](http://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=1281355)
+* fixed issue with /home mount on nfs [RHBZ#1281369](http://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=1281369)