feat: add Dockerfiles for frontend and backend, and a Gitea workflow for building and pushing images.

src/Hospitality.Backend/Dockerfile

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+# --- Build stage ---
+FROM mcr.microsoft.com/dotnet/sdk:9.0 AS build
+WORKDIR /src
+
+# Kopier alt
+COPY . .
+
+# Publiser i Release
+RUN dotnet publish "Hospitality.Backend.csproj" -c Release -o /app/publish
+
+# --- Runtime stage ---
+FROM mcr.microsoft.com/dotnet/aspnet:9.0 AS final
+WORKDIR /app
+
+# Kopier publisert output
+COPY --from=build /app/publish .
+
+# Appen lytter standard til ASPNETCORE_URLS
+EXPOSE 8080
+ENV ASPNETCORE_URLS=http://0.0.0.0:8080
+
+ENTRYPOINT ["dotnet", "Hospitality.Backend.dll"]

src/hospitality-web/Dockerfile

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+# --- Build stage ---
+FROM node:22 AS build
+WORKDIR /app
+
+# Installer dependencies
+COPY package*.json ./
+RUN npm ci
+
+# Kopier resten av koden
+COPY . .
+
+# Bygg for produksjon
+RUN npm run build
+
+# --- Runtime stage ---
+FROM nginx:alpine
+WORKDIR /usr/share/nginx/html
+
+# Legg inn bygget frontend
+COPY --from=build /app/dist .
+
+# Nginx server som statisk side
+EXPOSE 80