Fix - Gotenberg: Helm installation fails because of incorrect access in with block

[SimonWoidig]

Fixes #39 by using the global scope where needed.

Tasks:

• [x] I've made changes
• [x] I've bumped chart's version in Chart.yaml
• [x] I've added changes to charts CHANGELOG.md
• [x] I've run helm-docs

[MaikuMori]

Thanks for the pr, looks good.

[MaikuMori]

Since I can't push to this PR, I've created a new one, preserving the commits.

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