misc: add concourse ci

[inkhey]

PR Goal

• Add Concourse CI support
• update drawio dependencies install

New issue related to this fix:

• https://github.com/algoo/preview-generator/issues/282

• https://github.com/algoo/preview-generator/issues/281

  Implemented solution

• Add Concourse CI

• update drawio dependencies install

Checkpoints

• [x] If relevant, manual tests have been done to ensure the stability of the whole application and that the involved feature works
• [x] Automated tests covering the feature or the fix, have been written, deemed irrelevant (give the reason), or an issue has been created to implement the test (give the link)
• [ ] The PR or the original issue contains a short summary of the implemented solution.