Nginx refused to boot when a hostname was invalid

[martinothamar]

Description

Nginx refused to boot when a hostname was invalid Letting the upstream be a variable makes Nginx not crash on startup, and it will resolve dynamically

Related Issue(s)

• 97

Verification

• [x] Your code builds clean without any errors or warnings
• [x] Manual testing done (required)
• [ ] Relevant automated test added (if you find this hard, leave it and we'll help out)
• [ ] All tests run green

Documentation

• [ ] User documentation is updated with a separate linked PR in altinn-studio-docs. (if applicable)