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-1.4.8.md

@@ -0,0 +1,77 @@
+---
+layout: default
+title: Release Notes 1.4.8
+---
+
+Released on 2017-12-22.
+
+Features:
+* There is a new option --config-opts [GH#138](https://github.com/rpm-software-management/mock/issues/138)
+
+You can run:
+
+```
+    mock --config-opts yum_command=/usr/bin/yum-deprecated --enable-network
+```
+
+which will set:
+
+```
+    config_opts['system_yum_command'] = '/usr/bin/yum'
+```
+
+or for a list:
+
+```
+    mock --config-opts extra_chroot_dirs=/mnt/b --config-opts extra_chroot_dirs=/mnt/a
+```
+
+which will set
+
+```
+    config_opts['extra_chroot_dirs'] = ['/mnt/b', '/mnt/a']
+```
+
+or list with a single item:
+
+```
+    mock --config-opts extra_chroot_dirs=/mnt/b --config-opts extra_chroot_dirs=
+```
+
+which will set
+
+```
+    config_opts['extra_chroot_dirs'] = ['/mnt/b']
+```
+
+It can detect boolean:
+
+```
+    mock --config-opts nosync=False --debug-config |grep nosync
+    config_opts['nosync'] = False
+```
+
+A specialized option has priority. Therefore:
+
+```
+    mock --config-opts rpmbuild_networking=False --enable-network --debug-config |grep rpmbuild_networking
+    config_opts['rpmbuild_networking'] = True
+```
+
+It is unable to set complicated variables. Like config_opts['plugin_conf']['package_state_opts'] or anything which has dictionary as value.
+
+* There is a new option. `--enable-network` which is equivalent to `config_opts['rpmbuild_networking'] = True`
+
+Bugfixes:
+* orphanskill now emits SIGKILL when SIGTERM is not enough [RHBZ#1495214](https://bugzilla.redhat.com/show_bug.cgi?id=1495214)
+* when mock tries to force umount, it will try umount recursively
+* do not change to directory if nspawn is used [GH#108](https://github.com/rpm-software-management/mock/issues/108)
+* when creating yum/dnf.conf, mock now copy timestamp from the host [RHBZ#1293910](https://bugzilla.redhat.com/show_bug.cgi?id=1293910)
+* We now mount /proc and /sys in chroot before executing any package manager command (outside of chroot)[RHBZ#1467299](https://bugzilla.redhat.com/show_bug.cgi?id=1467299)
+* Dependencies of mock-scm (git, cvs, tar, subversion) are now soft dependencies (Recommends) [RHBZ#1515989](https://bugzilla.redhat.com/show_bug.cgi?id=1515989)
+* Previously job control in `mock shell` does not work. [RHBZ#1468837](https://bugzilla.redhat.com/show_bug.cgi?id=1468837). This was a glibc bug and it is resolved in rawhide now.
+
+Following contributors contributed to this release:
+
+* Matt Wheeler
+* Matthew Stoltenberg