gitlab: add bug report template

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4089>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4089>

.gitlab/issue_templates/Bug Report.md

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+### Before submitting your bug report:
+- Check if a new version of Mesa is available which might have fixed the problem.
+- If you can, check if the latest development version (git master) works better.
+- Check if your bug has already been reported here.
+- For any logs, backtraces, etc - use [code blocks](https://docs.gitlab.com/ee/user/markdown.html#code-spans-and-blocks)
+- As examples of good bug reports you may review one of these - #2598, #2615, #2608
+
+
+Otherwise, please fill the requested information below.
+And please remove anything that doesn't apply to keep things readable :)
+
+
+### System information
+
+Please post `inxi -GSC -xx` output OR fill information below manually
+
+
+- OS: (`cat /etc/os-release | grep "NAME"`)
+- GPU: (`lspci | grep VGA` or `lshw -C display`)
+- Kernel version: (run `uname -a`)
+- Mesa version: (`glxinfo -B | grep "OpenGL version string"`)
+- Xserver version (if applicable): (`sudo X -version`)
+- Desktop manager and compositor:
+
+#### If applicable
+- DXVK version:
+- Wine/Proton version:
+
+
+### Describe the issue
+
+Please describe what you are doing, what you expect and what you're
+seeing instead.
+
+"It doesn't work" usually is not a helpful description of an issue. 
+The more detail about how things are going wrong, the better.
+
+
+### Regression
+
+Did it used to work? It can greatly help to know when the issue started.
+
+
+### Log files as attachment
+- Output of `dmesg`
+- Backtrace
+- Gpu hang details
+
+
+### Screenshots/video files (if applicable)
+
+
+
+### Any extra information would be greatly appreciated