Issue title: docker aspnet:6.0-alpine image not rendered in pdf file
 Issue body: Hi all,
in this thread [https://github.com/HakanL/WkHtmlToPdf-DotNet/issues/88](url) we can create pdf using aspnet:6.0-alpine as image base.
If in the html file we have an image in base 64
<img src='data:image/jpeg;base64,iVBORw0KGg.......
The image is not rendered.

docker file:

`RUN apk update && \
	apk add --no-cache \
		bash \
		icu-libs \
		krb5-libs \
		libgcc \
		libintl \
		libssl1.1 \
		libstdc++ \
		zlib \
		libstdc++ \
		libx11 \
		libxrender \
		libxext \
		libssl1.1 \
		libjpeg \
		gcompat \
		ca-certificates \
		fontconfig \
		freetype \
		ttf-dejavu \
		ttf-droid \
		ttf-freefont \
		ttf-liberation && \
	apk add --no-cache libgdiplus --repository http://dl-3.alpinelinux.org/alpine/edge/testing/ && \
	ln -s /usr/lib/libjpeg.so.8 /usr/lib/libjpeg.so.62


FROM mcr.microsoft.com/dotnet/sdk:6.0-alpine AS build
WORKDIR /src
......
`

Any suggestions?
Thanks in advance
Stefano
 Comments: 
 Comment 0: Test it in the non-Alpine docker sample first to determine if it's related to Alpine, or wkhtmltopdf. If it doesn't work in either docker container then test it with the native wkhtmltopdf to make sure your HTML is correct and is supported by the parent library (wkhtmltopdf).
 Comment 1: > Test it in the non-Alpine docker sample first to determine if it's related to Alpine, or wkhtmltopdf. If it doesn't work in either docker container then test it with the native wkhtmltopdf to make sure your HTML is correct and is supported by the parent library (wkhtmltopdf).

Hi HakanL,
i've tried using this image
FROM mcr.microsoft.com/dotnet/aspnet:6.0 AS base
WORKDIR /app
EXPOSE 443

# Install dependencies
RUN apt-get update \
    && apt-get install -y --no-install-recommends \
        zlib1g \
		libgdiplus \
        libc6-dev \
		ca-certificates \
		fontconfig \
		fontconfig-config \
		fonts-dejavu-core \
		libbsd0 \
		libexpat1 \
		libfontconfig1 \
		libfontenc1 \
		libfreetype6 \
		libjpeg62-turbo \
		libpng16-16 \
		libssl1.1 \
		libx11-6 \
		libx11-data \
		libxau6 \
		libxcb1 \
		libxdmcp6 \
		libxext6 \
		libxrender1 \
		ucf \
		x11-common \
		xfonts-75dpi \
		xfonts-base \
		xfonts-encodings \
		xfonts-utils \
     && rm -rf /var/lib/apt/lists/*

The image in base64 render fine, I think is a package add problem...
Stefano

 Comment 2: Ok, good you tested that. So then it's a matter of figuring out which packages are required, or it may be that the libjpeg8 library we had to use in alpine with a soft link isn't handling base64 images (I'm assuming). It's always tricky with native libraries. Please post back if you figure it out, I don't think I can be of much more help here.
 Comment 3: @stefanodesimone Did you figured out issue and what packages you need to include? If you did, it would be helpful if you can share Docker file sections related to wkhtmltopdf installation/setup, because I run into some issues too. 

@HakanL It might be useful to provide instructions for installation on Alpine Linux, as it is the most widely used image for .net/C# projects and running them in production.


 Comment 4: It's quite involved, you have to re-compile wkthtmltopdf from source to make it compatible with Alpine so images work. It may be possible, but I'm not sure it's worth it just to support Alpine. Feel free to look into a PR if you want. Here's a good starting point: https://github.com/madnight/docker-alpine-wkhtmltopdf
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