You could use Docker Compose for several apps. YAML file docker-compose.yml will refer to Dockerfile for each app:

version: '3.4'

services:
  webfrontend:
    image: ${DOCKER_REGISTRY-}webfrontend
    build:
      context: .
      dockerfile: WebFrontEnd/Dockerfile

  mywebapi:
    image: ${DOCKER_REGISTRY-}mywebapi
    build:
      context: .
      dockerfile: MyWebAPI/Dockerfile

Add Docker File with Nginx Reverse Proxy Server

For Blazor Web Assembly we need to add "nginx.conf" in Project root folder

events { }
http {
   include mime.types;
   types {
      application/wasm wasm;
   }
   server {
      listen 80;
     # Here, we set the location for Nginx to serve the files looking for index.html
     location / {
        root .;
        try_files $uri $uri/ /index.html =404;
     }
  }
}

Now in Dockerfile mention it like

FROM mcr.microsoft.com/dotnet/aspnet:6.0 AS base
WORKDIR /app
EXPOSE 80

FROM mcr.microsoft.com/dotnet/sdk:6.0 AS build
WORKDIR /src
COPY ["projectpath/projectname.csproj", "projectpath"]
RUN dotnet restore "projectpath/projectname.csproj"
COPY . .
WORKDIR "/projectpath"
RUN dotnet build "projectname.csproj" -c Release -o /app/build

FROM build AS publish
RUN dotnet publish "projectname.csproj" -c Release -o /app/publish

FROM base AS final
WORKDIR /app
COPY --from=publish /app/publish .
ENTRYPOINT ["dotnet", "projectname.dll"]

FROM nginx:alpine AS final
WORKDIR /usr/share/nginx/html
#Copy from Environment(build/publish)
COPY --from=publish app/publish/wwwroot .

Now build and run the project in docker.