Add code for update-lambda

update_lambda/requirements.txt

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+boto3==1.18.34
+botocore==1.21.34
+jmespath==0.10.0
+python-dateutil==2.8.2
+s3transfer==0.5.0
+six==1.16.0
+urllib3==1.26.6
+python-decouple==3.4

update_lambda/src/request_handler.py

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+from boto3 import Session
+from decouple import config
+
+
+def event_handler(event, context):
+    session: Session = configure_boto3_session()
+
+    bucket_name = event["Records"][0]["s3"]["bucket"]["name"]
+    s3_key = event["Records"][0]["s3"]["object"]["key"]
+
+    s3_client = session.client('s3')
+    metadata = s3_client.head_object(Bucket=bucket_name, Key=s3_key)
+    functionArn = metadata["ResponseMetadata"]["HTTPHeaders"]["x-amz-meta-function-arn"]
+
+    lambda_client = session.client('lambda')
+    response = lambda_client.update_function_code(
+        FunctionName=functionArn,
+        S3Bucket=bucket_name,
+        S3Key=s3_key,
+        Publish=True
+    )
+
+    print(f"This is the response: {response}")
+
+
+def configure_boto3_session() -> Session:
+    return Session(
+        aws_access_key_id=config("aws_access_key_id"),
+        aws_secret_access_key=config("aws_secret_access_key"),
+        region_name="eu-west-1"
+    )