Merge branch 'configurable-disk-size' into 'master'

Make disk size configurable per image

Closes #127

See merge request !160
6 jobs for master in 35 minutes and 54 seconds (queued for 4 seconds)
Status Name Job ID Coverage
  Lint
passed shellcheck #15619

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passed shfmt #15620

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  Build
passed build:secure #15621
secure

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  Test
passed test-basic-qemu #15623
fast-single-thread

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passed test-cloudimg-qemu #15624
fast-single-thread

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passed test-vagrant-boxes-format #15622

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