feat: this commit introduces dockerfile and .dockerignore for proxy application

Author: https-richardy

Applications/Proxy/.dockerignore

@@ -0,0 +1,25 @@
+**/.vs
+**/.git
+
+**/bin
+**/obj
+**/.vscode
+**/TestResults
+
+**/appsettings.json
+**/appsettings.Development.json
+**/appsettings.*.json
+
+.env
+.env.*
+.env.example
+
+*.user
+*.suo
+*.userosscache
+*.sln.docstates
+.gitattributes
+
+Dockerfile
+README.md
+LICENSE

Applications/Proxy/Dockerfile

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+# use ASP.NET Core 9.0 runtime image (alpine) as base
+FROM mcr.microsoft.com/dotnet/aspnet:9.0-alpine AS base
+WORKDIR /artifacts
+EXPOSE 8080
+
+# use SDK image (Alpine) for build
+FROM mcr.microsoft.com/dotnet/sdk:9.0-alpine AS build
+WORKDIR /workdir
+
+ARG BUILD_CONFIGURATION=Release
+ARG SOLUTION=HttpsRichardy.Federation.Proxy
+
+# copy only csproj and sln to restore as early as possible
+COPY ["Source/${SOLUTION}.WebApi/${SOLUTION}.WebApi.csproj", "${SOLUTION}.WebApi/"]
+COPY ["${SOLUTION}.sln", "./"]
+
+# restore dependencies
+RUN dotnet restore "${SOLUTION}.WebApi/${SOLUTION}.WebApi.csproj"
+
+# copy the rest of the source code
+COPY Source/ ./Source/
+
+WORKDIR "/workdir/Source/${SOLUTION}.WebApi"
+
+# build in Release mode
+RUN dotnet build "${SOLUTION}.WebApi.csproj" -c $BUILD_CONFIGURATION -o /artifacts/build
+
+# publish the project for production
+RUN dotnet publish "${SOLUTION}.WebApi.csproj" -c $BUILD_CONFIGURATION -o /artifacts/publish /p:UseAppHost=false
+
+# final image to run the app
+FROM base AS final
+WORKDIR /artifacts
+
+ENV ASPNETCORE_URLS=http://+:8080
+ENV DOTNET_SYSTEM_GLOBALIZATION_INVARIANT=true
+ENV DOTNET_RUNNING_IN_CONTAINER=true
+
+# copy published files from the build stage
+COPY --from=build /artifacts/publish .
+
+ENTRYPOINT ["dotnet", "HttpsRichardy.Federation.Proxy.WebApi.dll"]