first commit

Dockerfile

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+FROM mcr.microsoft.com/dotnet/sdk:8.0-alpine AS build
+WORKDIR /src
+COPY src/TcpEcho/TcpEcho.csproj TcpEcho/
+RUN dotnet restore TcpEcho/TcpEcho.csproj
+COPY src/TcpEcho/ TcpEcho/
+RUN dotnet publish TcpEcho/TcpEcho.csproj -c Release -o /app --no-restore
+
+FROM mcr.microsoft.com/dotnet/runtime:8.0-alpine
+ARG VERSION=dev
+ARG REVISION=unknown
+ARG CREATED=""
+# OCI labels: Gitea's package registry displays these on the package page and, when
+# image.source matches a repository URL, links the package to that repository.
+LABEL org.opencontainers.image.title="tcp-echo-server" \
+      org.opencontainers.image.description="Minimal .NET 8 TCP echo server that prefixes every reply with its instance identifier. Deployed as two instances behind Traefik on ports 9098 and 9099." \
+      org.opencontainers.image.source="https://gitea.eitczech.com/public/tcp-echo-server" \
+      org.opencontainers.image.url="https://gitea.eitczech.com/public/tcp-echo-server" \
+      org.opencontainers.image.documentation="https://gitea.eitczech.com/public/tcp-echo-server/src/branch/main/README.md" \
+      org.opencontainers.image.vendor="eitczech" \
+      org.opencontainers.image.licenses="MIT" \
+      org.opencontainers.image.version="${VERSION}" \
+      org.opencontainers.image.revision="${REVISION}" \
+      org.opencontainers.image.created="${CREATED}"
+WORKDIR /app
+COPY --from=build /app .
+ENV PORT=9099
+EXPOSE 9099
+USER 1654
+ENTRYPOINT ["dotnet", "TcpEcho.dll"]