Make sure checks.d directory is present #213
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What does this PR do?
It makes sure the checks.d directory is present in the container.
Motivation
Otherwise the following copy command will create a file called 'checks.d' for the first check file.
We weren't previously able to mount a checks.d directory as a volume. The mounting-as-a-volume part worked, but the copying-to-the-actual-directory part was broken because the target checks.d directory within the container didn't exist.