Added app.yml for CI pipeline and implemented docker

.github/workflows/app.yml

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+name: Flight Reservation CI/CD Pipeline
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    services:
+      postgres:
+        image: postgres:13
+        env:
+          POSTGRES_USER: postgres
+          POSTGRES_PASSWORD: password
+          POSTGRES_DB: flightreservation
+        ports:
+          - 5432:5432
+        options: --health-cmd pg_isready --health-interval 10s --health-timeout 5s --health-retries 5
+
+    steps:
+      - uses: actions/checkout@v3
+      - name: Set up JDK 17
+        uses: actions/setup-java@v3
+        with:
+          java-version: '17'
+          distribution: 'temurin'
+          cache: maven
+      - name: Cache Maven dependencies
+        uses: actions/cache@v3
+        with:
+          path: ~/.m2/repository
+          key: ${{ runner.os }}-maven-${{ hashFiles('**/pom.xml') }}
+          restore-keys: |
+            ${{ runner.os }}-maven-
+      - name: Build with Maven
+        run: mvn -B clean package
+      - name: Archive Production Artifact
+        uses: actions/upload-artifact@v3
+        with:
+          name: package
+          path: target/*.jar
+
+  test:
+    runs-on: ubuntu-latest
+    needs: build
+
+    services:
+      postgres:
+        image: postgres:13
+        env:
+          POSTGRES_USER: postgres
+          POSTGRES_PASSWORD: password
+          POSTGRES_DB: flightreservation
+        ports:
+          - 5432:5432
+        options: --health-cmd pg_isready --health-interval 10s --health-timeout 5s --health-retries 5
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+      - name: Set up JDK 17
+        uses: actions/setup-java@v3
+        with:
+          java-version: '17'
+          distribution: 'temurin'
+          cache: maven
+      - name: Cache Maven dependencies
+        uses: actions/cache@v3
+        with:
+          path: ~/.m2/repository
+          key: ${{ runner.os }}-maven-${{ hashFiles('**/pom.xml') }}
+          restore-keys: |
+            ${{ runner.os }}-maven-
+      - name: Run Tests with Maven
+        run: mvn -B verify
+      - name: Archive Test Reports
+        uses: actions/upload-artifact@v3
+        with:
+          name: test-reports
+          path: target/surefire-reports

Dockerfile

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+FROM openjdk:17-jdk-slim AS build
+
+COPY pom.xml mvnw ./
+COPY .mvn .mvn
+RUN ./mvnw dependency:resolve
+
+COPY src src
+RUN ./mvnw package -DskipTests
+
+FROM openjdk:17-jdk-slim
+WORKDIR /flightreservation
+COPY --from=build target/*.jar flightreservation.jar
+
+ENTRYPOINT ["java", "-jar", "flightreservation.jar"]

docker-compose.yml

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+version: '3.9'
+
+services:
+  app:
+    image: 'flightreservation'
+    build:
+      context: .
+      dockerfile: Dockerfile
+    container_name: flightreservation
+    ports:
+      - "8080:8080"
+    environment:
+      - SPRING_DATASOURCE_URL=jdbc:postgresql://db:5432/flightreservation
+      - SPRING_DATASOURCE_USERNAME=postgres
+      - SPRING_DATASOURCE_PASSWORD=password
+    depends_on:
+      - db
+
+  db:
+    image: postgres:13-alpine
+    container_name: postgres
+    environment:
+      - POSTGRES_DB=flightreservation
+      - POSTGRES_USER=postgres
+      - POSTGRES_PASSWORD=password
+      - POSTGRES_HOST_AUTH_METHOD=trust