DinkToPdf Net Core not showing image in docker container

I’m trying to generate PDFs from HTML using DinkToPdf library with docker, but i can’t get that showing the image from docker container running, while debugging from windows I have no problems:

I have added many libraries to my dockerfile that i have seen in others topics, but i have not been successful. My dockerfile is as follows:

FROM mcr.microsoft.com/dotnet/core/sdk:3.1 AS build
WORKDIR /src
COPY . .
WORKDIR /src/WebApi
RUN dotnet restore
RUN dotnet publish -c Release -o out

FROM mcr.microsoft.com/dotnet/core/aspnet:3.1    
RUN apt-get update && apt-get install -y libgdiplus 
        ca-certificates 
        xvfb 
        libfontconfig 
        wkhtmltopdf 
        fontconfig 
        zlib1g 
        fontconfig 
        libfreetype6 
        libx11-6 
        libxext6 
        libxrender1 
        libjpeg62-turbo 
        libxcb1 
        xfonts-75dpi 
        xfonts-base 
        openssl 
        wget 
        gdebi
WORKDIR /app
COPY --from=build /src/WebApi/out ./
ENTRYPOINT ["dotnet", "WebApi.dll"]

Any idea what library I need to add to the dockerfile to show the images?

PS: My html code:

<table class='tbl' cellpadding='5'>
    <tbody>
        <tr>
            <td class='tbl-img'>
                <img src='https://pngimg.com/uploads/batman/batman_PNG75.png' alt='' height='51' width='200' />
            </td>
        </tr>
        <tr>
            <td class='tbl-title'>THIS IS THE TITLE OF THE DOCUMENT</td>
        </tr>
        <tr>
            <td class='tbl-subtitle'>THIS IS THE SUBTITLE OF THE DOCUMENT</td>
        </tr>
    </tbody>
</table>