Build Image in Azure fails due to wrong build context

### This issue is for a: (mark with an `x`)
```
- [x] bug report -> please search issues before submitting
- [ ] feature request
- [ ] documentation issue or request
- [ ] regression (a behavior that used to work and stopped in a new release)
```

### Minimal steps to reproduce
> Same as reported in https://github.com/MicrosoftDocs/azure-docs/issues/101118 and https://github.com/Azure-Samples/containerapps-albumapi-javascript/issues/3

### Any log messages given by the failure

> see above

### Expected/desired behavior

> see above

### OS and Version?

> Any

### Versions

> Any

### Mention any other details that might be useful

Solution same as in https://github.com/Azure-Samples/containerapps-albumapi-javascript/pull/4/files

It might also apply to the other sample repositories