Add integration tests for db2json and json2db

This adds integration tests for db2json and json2db and extends the Exception handling in the script endpoints. A facility to run arbitrary commands has been added (for testing purposes, but also for upcoming integration of git and gpg command calls).

Tox now has a target that only runs the integration tests (tox -e integration).

Fixes #9 (closed)

added scopeenhancement label

added 1 commit

• b6257478 - Add integration tests to gitlab CI

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added 3 commits

• aaf40e02 - Extend tests for CLI and add integration tests
• 441d7c00 - Add integration test target for tox
• 9ba649d1 - Add integration tests to gitlab CI

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mentioned in commit 3c443e22

merged