docs: instructions for running zipper part of app

.env-example

@@ -11,6 +11,8 @@ FORCE_REDOWNLOAD_AFTER_HOURS=24
 
 REMOVE_LAST_GOOD_DOWNLOAD_AFTER_FAILING_HOURS=72
 
+ZIP_WORKING_DIR=/tmp/bulk-data-service-zip
+
 # Sample local setup - values read by docker compose (for simple Postgres DB
 # creation), and used by the app
 DB_NAME=bulk_data_service_db

README.md

@@ -59,12 +59,21 @@ docker compose up
 
 The example `.env` file (`.env-example`) is configured to use the above docker compose setup. If you don't use the docker compose setup, then you will need to change the values in the `.env` file accordingly.
 
-Once the docker compose setup is running, start the bulk download app with:
+Once the docker compose setup is running, you can run the dataset updater part of the app with (this will download the datasets and upload them to Azurite):
 
 ```
 dotenv run python src/iati_bulk_data_service.py -- --operation checker --single-run --run-for-n-datasets=50
 ```
 
+You can run the zipper operation with:
+
+```
+dotenv run python src/iati_bulk_data_service.py -- --operation zipper --single-run
+```
+
+It will store the ZIP files in the directory defined in the `ZIP_WORKING_DIR` environment variable.
+
+
 *Note:* not all versions of `dotenv` require a `run` subcommand.
 
 ## Development on the app