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Add startupProbe. And the headers may actually be useful.

feat: custom stage build commands for static js

See merge request !41

fix: exit shell scripts immediately if error occurs

See merge request !47

So scripts behave the same as `script:` sections in the pipeline.

Fixes helm errors not failing the deploy job.
```
Error: UPGRADE FAILED:
Deployment successful 😻
```

Fix for monorepo APP_DIR prefix nginx

See merge request !45

F/monorepo separate test

See merge request !43

Obsoleted by `DEFAULT_VALUE_application_command` in include.