updated docker file and workflow

.github/workflows/cicd.yml

@@ -0,0 +1,64 @@
+name: CI/CD for Dockerized Flask App
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  dockerbuild:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+    - name: Build The Docker Image
+      run: docker build . --file DockerFile --tag workflow-test:$(date +%s)
+  build-and-test:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v3
+
+    - name: Set up Python
+      uses: actions/setup-python@v4
+      with:
+        python-version: '3.9'
+
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install flask
+        pip install pytest
+
+    - name: Run tests
+      run: |
+        pytest
+
+  build-and-publish:
+    needs: build-and-test
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v3
+
+    - name: Set up Docker Buildx
+      uses: docker/setup-buildx-action@v2
+
+    - name: Login to DockerHub
+      uses: docker/login-action@v2
+      with:
+        username: ${{ secrets.DOCKER_USERNAME }}
+        password: ${{ secrets.DOCKER_PASSWORD }}
+
+    - name: Build and push Docker image
+      uses: docker/build-push-action@v4
+      with:
+        context: .
+        file: ./DockerFile
+        push: true
+        tags: ${{ secrets.DOCKER_USERNAME }}/flasktest-app:latest
+
+    - name: Image digest
+      run: echo ${{ steps.build-and-publish.outputs.digest }}

DockerFile

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+FROM python:3.9-slim
+
+WORKDIR /app
+
+COPY . /app
+
+RUN pip install flask
+
+EXPOSE 5001
+
+CMD [ "python" , "app.py" ]    

app.py

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+from flask import Flask
+
+app = Flask(__name__)
+
+@app.route('/')
+def home():
+    return 'Hello, World!'
+
+if __name__ == '__main__':
+    app.run(host="0.0.0.0", port=5001)

test_app.py

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+from app import app
+
+def test_home():
+    response = app.test_client().get('/')
+    assert response.status_code == 200
+    assert response.data == b'Hello, World!'