Change loglevel for copying files to debug (#303)

[dzoeteman]

Changes loglevel for copying files to debug.
Copying files generates too much output (can easily get into MBs with big images).

Fixes #303.

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[container-tools-bot]

Hi @dzoeteman. Thanks for your PR.

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[dzoeteman]

I signed it!

[googlebot]

CLAs look good, thanks!

[priyawadhwa]

Thanks for your contribution!