Fix example pod.yml to not mount to root

[jsravn]

As mounting to root makes /root a read only filesystem, which breaks a lot of builds that try to add files to /root (like /root/.npm).

Fixes #495.

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[jsravn]

Is /kaniko/.docker the canonical choice over /root/.docker? Both seem to work.

[tejal29]

/kaniko/.docker the

@jsravn /root/.docker would work if your build is not adding files to /root which is the case in your build.