chore: Add docker buildx '2d' file to .gitignore (#1111)

## Description:
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-->
Docker buildx, when fail (at least on my machine), produces this "2d"
file. I avoided well so far, but last PR I accidentally committed and
pushed it. I couldn't root cause why is that, but seems to be non
controversial to add it to git ignore.

## Is this change user facing?
NO
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<!-- If yes, don't forget to include docs changes where relevant -->

## References (if applicable):
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information. -->

.gitignore

@@ -73,6 +73,8 @@ doc/tags
 # Test binary, built with `go test -c`
 *.test
 
+# Docker Buildx Logfile
+/2d
 
 # Output directories
 build/