Add Docker support for FoodsharingSiegen project

Introduced Docker setup, including `docker-compose.yml`, `dockerfile.server`, and related Python helper scripts (`image-create.py`, `image-push.py`, `publish-project.py`, `publish-aio.py`) for building, managing, and deploying Docker images. Updated `.gitignore` to exclude published files, and renamed a field label in the Blazor component for better clarity.

Docker/dockerfile.server

@@ -0,0 +1,11 @@
+FROM mcr.microsoft.com/dotnet/aspnet:9.0 AS base
+RUN apt-get update && apt-get install iputils-ping -y
+
+LABEL org.opencontainers.image.source=https://github.com/TroogS/FoodsharingSiegen
+
+WORKDIR /app
+
+# Copy the Blazor Server published files from the Publish folder relative to the build context
+COPY ../Publish/Server/ .
+
+ENTRYPOINT ["dotnet", "FoodsharingSiegen.Server.dll"]