Add the .gradletasknamecache file to .gitignore

[janhoy]

This file has recently started popping up as changed. I think it should be ignored, as it causes e.g. gradlew check -x tests to fail with "not clean checkout"

[cpoerschke]

This file has recently started popping up as changed. ...

Interesting. My local repo does not (yet) have the file at all but instead there's some other Eclipse files which could be .gitignore-ed like this:

**/.project
**/.classpath
**/.settings/

[janhoy]

Digging some more, appears that it is my gradle plugin to oh-my-zsh for Mac'sZSH that actually produces this file, probably when you type gradle<space><space>, to avoid querying task list every time, see https://github.com/ChrisCummins/oh-my-zsh/blob/master/plugins/gradle/gradle.plugin.zsh

Mac + ZSH + oh-my-zsh may be common enough for us to ignore the file, wdyt? Another option would be to check in the file, since the list of gradle tasks won't update unless build.gradle is newer than .gradletasknamecache...

Wdyt?

[janhoy]

Actually the logic for when to re-generate the cache file is not sufficient to detect changes to Solr's build, since we rely on including files, so there may be a new gradle task added without the top-level build.gradle having changed. Thus users may need to nuke the cache file if it gets very old. I still think I vote for the ignore path here.