wkhtmltopdf / qtwebkit

Question

Hi! Can't get wkhtmltopdf to work in my DRF project on railway. 
Project: Django DRF
Trying to add: wkhtmltopdf

Works running locally. But when added into the railway.config and ran, I get this error in a loop. Seems like qtwebkit is the issue? Does NixOS (if I understand that is what railway is running with) need another library?

Error:

```#8 368.6 /tmp/nix-build-qtwebkit-5.212.0-alpha4.drv-0/source/Source/WebCore/svg/SVGLength.h:62:5: note: because 'WebCore::SVGLength' has user-provided 'WebCore::SVGLength::SVGLength(const WebCore::SVGLength&)'

#8 368.6    62 |     SVGLength(const SVGLength&);

#8 368.6       |     ^~~~~~~~~

#8 368.6 /tmp/nix-build-qtwebkit-5.212.0-alpha4.drv-0/source/Source/WebCore/svg/SVGRadialGradientElement.h: In member function 'void WebCore::SVGRadialGradientElement::setCxBaseValue(const WebCore::SVGLength&, bool)':

#8 368.6 /tmp/nix-build-qtwebkit-5.212.0-alpha4.drv-0/source/Source/WebCore/svg/properties/SVGAnimatedPropertyMacros.h:140:35: warning: implicitly-declared 'WebCore::SVGLength& WebCore::SVGLength::operator=(const WebCore::SVGLength&)' is deprecated [8;;https://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html#index-Wdeprecated-copy-Wdeprecated-copy8;;]

#8 368.6   140 |         m_##LowerProperty.value = type; \

#8 368.6       |                                   ^~~~

#8 368.6 /tmp/nix-build-qtwebkit-5.212.0-alpha4.drv-0/source/Source/WebCore/svg/SVGAnimatedLength.h:33:1: note: in expansion of macro 'DECLARE_ANIMATED_PROPERTY'

#8 368.6    33 | DECLARE_ANIMATED_PROPERTY(SVGAnimatedLength, SVGLength, UpperProperty, LowerProperty, )

#8 368.6       | ^~~~~~~~~~~~~~~~~~~~~~~~~

#8 368.6 /tmp/nix-build-qtwebkit-5.212.0-alpha4.drv-0/source/Source/WebCore/svg/SVGRadialGradientElement.h:50:9: note: in expansion of macro 'DECLARE_ANIMATED_LENGTH'

#8 368.6    50 |         DECLARE_ANIMATED_LENGTH(Cx, cx)

#8 368.6       |         ^~~~~~~~~~~~~~~~~~~~~~~

#8 368.6 /tmp/nix-build-qtwebkit-5.212.0-alpha4.drv-0/source/Source/WebCore/svg/SVGLength.h:62:5: note: because 'WebCore::SVGLength' has user-provided 'WebCore::SVGLength::SVGLength(const WebCore::SVGLength&)'

#8 368.6    62 |     SVGLength(const SVGLength&);

#8 368.6       |     ^~~~~~~~~

#8 368.6 /tmp/nix-build-qtwebkit-5.212.0-alpha4.drv-0/source/Source/WebCore/svg/SVGRadialGradientElement.h: In member function 'void WebCore::SVGRadialGradientElement::setCyBaseValue(const WebCore::SVGLength&, bool)':

#8 368.6 /tmp/nix-build-qtwebkit-5.212.0-alpha4.drv-0/source/Source/WebCore/svg/properties/SVGAnimatedPropertyMacros.h:140:35: warning: implicitly-declared 'WebCore::SVGLength& WebCore::SVGLength::operator=(const WebCore::SVGLength&)' is deprecated [8;;https://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html#index-Wdeprecated-copy-Wdeprecated-copy8;;]

#8 368.6   140 |         m_##LowerProperty.value = type; \

#8 368.6       |                                   ^~~~

#8 368.6 /tmp/nix-build-qtwebkit-5.212.0-alpha4.drv-0/source/Source/WebCore/svg/SVGAnimatedLength.h:33:1: note: in expansion of macro 'DECLARE_ANIMATED_PROPERTY'

#8 368.6    33 | DECLARE_ANIMATED_PROPERTY(SVGAnimatedLength, SVGLength, UpperProperty, LowerProperty, )

#8 368.6       | ^~~~~~~~~~~~~~~~~~~~~~~~~
```

railway.config:
```
{
    "$schema": "https://schema.up.railway.app/railway.schema.json",
    "build": {
        "builder": "NIXPACKS",
        "nixpacksPlan": {
            "phases": {
                "setup": {
                    "nixPkgs": ["...", "ffmpeg", "wkhtmltopdf"],
                    "cmds": [
                        "...",
                        "sudo apt-get -y update && sudo apt-get install -y ffmpeg && sudo apt-get install -y wkhtmltopdf"
                    ]
                }
            }
        },
        "buildCommand": "poetry install"
    },
    "deploy": {
        "startCommand": "bash scripts/prod-start.sh",
        "restartPolicyType": "NEVER",
        "restartPolicyMaxRetries": 10
    }
}

```