Read the first ten lines of a config to check for headers #51
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There could be comments before the cloud-config header or jinja expressions as we found already[0] so our current header check its a bit strict.
This patch makes it so er read the first ten lines of the config source, check for # at the start and then check for the headers as we did before, so we are a bit more letinent in case the cloud-config header is not the first thing in the file
Fixes: kairos-io/kairos#1714