Added Dockerfile, Compose, and GitHub Actions pipeline

.github/workflows/docker-build.yml

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+name: CI/CD Pipeline - Docker Build
+
+on:
+  push:
+    branches: [ "main" ]
+  workflow_dispatch:
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout Code
+      uses: actions/checkout@v3
+
+    - name: Login to Docker Hub
+      uses: docker/login-action@v2
+      with:
+        username: ${{ secrets.DOCKER_USERNAME }}
+        password: ${{ secrets.DOCKER_PASSWORD }}
+
+    - name: Build and Push
+      uses: docker/build-push-action@v4
+      with:
+        context: .
+        push: true
+        tags: sonu7552/aspnetrun-realworld:latest

Dockerfile

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+# STAGE 1: Build
+# We switched from 'dotnet/core/sdk:3.1' to 'dotnet/sdk:5.0'
+FROM mcr.microsoft.com/dotnet/sdk:5.0 AS build
+WORKDIR /app
+
+# 1. Copy the project files
+COPY src/AspnetRun.Core/*.csproj ./src/AspnetRun.Core/
+COPY src/AspnetRun.Application/*.csproj ./src/AspnetRun.Application/
+COPY src/AspnetRun.Infrastructure/*.csproj ./src/AspnetRun.Infrastructure/
+COPY src/AspnetRun.Web/*.csproj ./src/AspnetRun.Web/
+
+# 2. Restore dependencies
+RUN dotnet restore src/AspnetRun.Web/AspnetRun.Web.csproj
+
+# 3. Copy the rest of the source code
+COPY src/ ./src/
+
+# 4. Build and Publish
+WORKDIR /app/src/AspnetRun.Web
+RUN dotnet publish -c Release -o /app/publish
+
+# STAGE 2: Runtime
+# We switched from 'dotnet/core/aspnet:3.1' to 'dotnet/aspnet:5.0'
+FROM mcr.microsoft.com/dotnet/aspnet:5.0 AS runtime
+WORKDIR /app
+COPY --from=build /app/publish .
+EXPOSE 80
+ENTRYPOINT ["dotnet", "AspnetRun.Web.dll"]

docker-compose.yml

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+version: '3.8'
+
+services:
+  # 1. THE WEB APPLICATION
+  aspnetrun-web:
+    image: aspnetrun-web
+    build:
+      context: .
+      dockerfile: Dockerfile
+    ports:
+      # Maps port 80 inside the container to port 8000 on your machine
+      - "8000:80"
+    environment:
+      - ASPNETCORE_ENVIRONMENT=Production
+      # This overrides the appsettings.json connection string
+      # 'db' refers to the service name below
+      - ConnectionStrings__AspnetRunConnection=Server=db;Database=AspnetRunDb;User Id=sa;Password=Password@12345;MultipleActiveResultSets=true
+    depends_on:
+      - db
+
+  # 2. THE SQL SERVER DATABASE
+  db:
+    image: mcr.microsoft.com/mssql/server:2019-latest
+    environment:
+      # SQL Server requires a strong password (Capital, lowercase, number, symbol)
+      - SA_PASSWORD=Password@12345
+      - ACCEPT_EULA=Y
+    ports:
+      - "1433:1433"