feat: create a server for cloud run

i thought buildpack did this but nope...

.vscode/settings.json

@@ -15,6 +15,7 @@
     "gcloud",
     "googleapis",
     "gserviceaccount",
+    "Gunicorn",
     "imdecode",
     "imencode",
     "IMREAD",

requirements.txt

@@ -1,8 +1,10 @@
 opencv-python==4.7.*
-pdf2image==1.16.*
 pandas==1.5.*
-google-cloud-storage==2.7.*
-google-cloud-logging==3.5.*
+pdf2image==1.16.*
+fastparquet==2023.1.0
+flask==2.2.*
 google-cloud-documentai==2.12.*
+google-cloud-logging==3.5.*
+google-cloud-storage==2.7.*
+gunicorn==20.1.*
 pyarrow==11.*
-fastparquet==2023.1.0

row_run_server.py

@@ -0,0 +1,40 @@
+#!/usr/bin/env python
+# * coding: utf8 *
+"""
+server.py
+a module that can receive web requests. this will be google cloud pub sub and
+possibly github web hooks
+"""
+
+import logging
+from os import getenv
+from sys import stdout
+
+from flask import Flask
+
+import row_run
+
+PORT = int(str(getenv("PORT"))) if getenv("PORT") else 8080
+app = Flask(__name__)
+
+logging.basicConfig(stream=stdout, level=logging.DEBUG)
+
+
+@app.route("/", methods=["POST"])
+def schedule():
+    """schedule: the route that gcp cloud scheduler invokes"""
+    row_run.ocr_all_mosaics()
+
+    return ("", 204)
+
+
+def start():
+    """start: start the server for cloud run"""
+
+    # This is used when running locally. Gunicorn is used to run the
+    # application on Cloud Run. See entrypoint in Dockerfile.
+    app.run(host="127.0.0.1", port=PORT, debug=False)
+
+
+if __name__ == "__main__":
+    start()