Cannot deploy firebase python functions using https

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I have a firebase project which is already beyond the point to restart everything and I already worked with the firebase functions framework as a proof of concept at the beginning with the standard functions from Google (add message) and creating collections in firestorm from the file works fine.
As soon as I now try to implement a function such as

def addmessage(req: https_fn.Request) -> https_fn.Response:
    """Take the text parameter passed to this HTTP endpoint and insert it into
    a new document in the messages collection."""
    # Grab the text parameter.
    original = req.args.get("text")
    if original is None:
        return https_fn.Response("No text parameter provided", status=400)

    firestore_client: = firestore.client()

    # Push the new message into Cloud Firestore using the Firebase Admin SDK.
    _, doc_ref = firestore_client.collection("messages").add({"original": original})

    # Send back a message that we've successfully written the message
    return https_fn.Response(f"Message with ID {} added.")

bash firebase deploy or firebase deploy --only functions gets stuck with the following error:

Could not create or update Cloud Run service addmessage, Container Healthcheck failed. Revision ‘addmessage-00001-ruv’ is not ready and cannot serve traffic. The user-provided container failed to start and listen on the port defined provided by the PORT=8080 environment variable. Logs for this revision might contain more information.

I already deleted the docker containers in the artifact registry and it does not change anything.

The functions seemingly asynchronously appear in the functions console after unsuccessful deployment with a warning triangle and unknown trigger and when redeployed, they can not be changed but only be deleted.

Aside from this behaviour, my project works fine.