Add a way to disable the sandbox

Due to bubblewrap's pickiness, mat2 can now be run without a sandbox, even if bubblewrap is installed.

mentioned in issue #120 (closed)

added 2 commits

• 3cef7fe7 - 1 commit from branch master
• eb09e38b - Add a way to disable the sandbox

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added 1 commit

• 2533092c - Add a way to disable the sandbox

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enabled an automatic merge when the pipeline for 2533092c succeeds

merged