build(api): add Dockerfile for API service

src/IncidentOps.Api/Dockerfile

@@ -0,0 +1,23 @@
+FROM mcr.microsoft.com/dotnet/sdk:10.0 AS build
+WORKDIR /src
+
+# Copy csproj files and restore
+COPY src/IncidentOps.Contracts/IncidentOps.Contracts.csproj src/IncidentOps.Contracts/
+COPY src/IncidentOps.Domain/IncidentOps.Domain.csproj src/IncidentOps.Domain/
+COPY src/IncidentOps.Infrastructure/IncidentOps.Infrastructure.csproj src/IncidentOps.Infrastructure/
+COPY src/IncidentOps.Api/IncidentOps.Api.csproj src/IncidentOps.Api/
+RUN dotnet restore src/IncidentOps.Api/IncidentOps.Api.csproj
+
+# Copy source and build
+COPY src/ src/
+WORKDIR /src/src/IncidentOps.Api
+RUN dotnet publish -c Release -o /app --no-restore
+
+FROM mcr.microsoft.com/dotnet/aspnet:10.0 AS runtime
+WORKDIR /app
+COPY --from=build /app .
+
+ENV ASPNETCORE_URLS=http://+:8080
+EXPOSE 8080
+
+ENTRYPOINT ["dotnet", "IncidentOps.Api.dll"]