Add project files.

docker/ElsaStudio.Dockerfile

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+FROM --platform=$BUILDPLATFORM mcr.microsoft.com/dotnet/sdk:9.0-bookworm-slim AS build
+WORKDIR /source
+
+# copy sources.
+COPY src/. ./src
+COPY ./NuGet.Config ./
+COPY *.props ./
+
+# restore packages.
+RUN dotnet restore "./src/apps/ElsaStudioWebAssembly/ElsaStudioWebAssembly.csproj"
+RUN dotnet restore "./src/apps/Elsa.Studio.Web/Elsa.Studio.Web.csproj"
+
+# build and publish (UseAppHost=false creates platform independent binaries).
+WORKDIR /source/src/apps/Elsa.Studio.Web
+RUN dotnet build "Elsa.Studio.Web.csproj" -c Release -o /app/build
+RUN dotnet publish "Elsa.Studio.Web.csproj" -c Release -o /app/publish /p:UseAppHost=false --no-restore -f net9.0
+
+# move binaries into smaller base image.
+FROM mcr.microsoft.com/dotnet/aspnet:9.0-bookworm-slim AS base
+WORKDIR /app
+COPY --from=build /app/publish ./
+
+EXPOSE 8080/tcp
+EXPOSE 443/tcp
+ENTRYPOINT ["dotnet", "Elsa.Studio.Web.dll"]