gitignore: Add compliance related files

These are generated by CI workflows and the main tree is also ignoring
them.

Signed-off-by: Johan Hedberg <[email protected]>

.gitignore

@@ -14,3 +14,32 @@ __pycache__/
 
 # docs
 /doc/_build*
+
+# The .cache directory will be used to cache toolchain capabilities if
+# no suitable out-of-tree directory is found.
+.cache
+
+# CI output
+compliance.xml
+_error.types
+
+# from check_compliance.py
+BinaryFiles.txt
+BoardYml.txt
+Checkpatch.txt
+ClangFormat.txt
+DevicetreeBindings.txt
+GitDiffCheck.txt
+Gitlint.txt
+Identity.txt
+ImageSize.txt
+Kconfig.txt
+KconfigBasic.txt
+KconfigBasicNoModules.txt
+KconfigHWMv2.txt
+KeepSorted.txt
+MaintainersFormat.txt
+ModulesMaintainers.txt
+Nits.txt
+Pylint.txt
+YAMLLint.txt