Modify existing app to expose API for health check

Signed-off-by: Milan Pandurov <milanpandurov@pm.me>

Dockerfile

@@ -2,4 +2,5 @@ FROM python:alpine3.17
 WORKDIR /app
 COPY . /app
 RUN pip install -r requirements.txt
+EXPOSE 9999
 ENTRYPOINT ["python", "app.py"]

app.py

@@ -1,9 +1,17 @@
-from flask import Flask
+from flask import Flask, request, jsonify
+
 app = Flask(__name__)
 
+@app.route('/alive', methods=['GET'])
+def get_healthcheck():
+    response = {
+        "alive": True
+    }
+    return jsonify(response)
+
 @app.route('/')
 def hello_world():
-    return 'Hello World Python Program.'
+    return 'Health check application.'
 
 if __name__ == "__main__":
    app.run(host="0.0.0.0", port=9999)