What is --from, as used in COPY command in Dockerfile?
I am seeing a dockerfile whose code is given below: FROM mcr.microsoft.com/dotnet/aspnet:5.0-buster-slim AS base WORKDIR /app EXPOSE 80 EXPOSE 443 FROM mcr.microsoft.com/dotnet/sdk:5.0-buster-slim AS build WORKDIR /src COPY ["FirstDockerApp/FirstDockerApp.csproj", "FirstDockerApp/"] RUN dotnet restore "FirstDockerApp/FirstDockerApp.csproj" COPY . . WORKDIR "