update env var for test file

dev/README.md

@@ -64,7 +64,8 @@ docker compose --profile worker up --build
     The key name `id_rsa` is used as a bind mount in the compose file.
 
 - Assuming the backend service is up (`docker compose up backend`), create a worker and assign them a list of countries to test for.
-    If no countries are provided, all available countries wiil be assigned to the worker.
+    If no countries are provided, all available countries in the DB wiil be assigned to the worker. You can update the countries using `mirrors-qa-backend update-worker`.
+
     In this example, we create a worker named `test` to test for mirrors in France, United States and Canada using the private key file
     named `id_rsa`.
     ```sh
@@ -115,6 +116,7 @@ The `backend` code houses the `scheduler` and the `RESTful API`. The following e
 - `WIREGUARD_HEALTHCHECK_TIMEOUT_SECONDS`
 - `WIREGUARD_HEALTHCHECK_RETRIES`
 - `TASK_WORKER_IMAGE`
+- `TEST_FILE_PATH`: location of file to run download speed test
 
 ## task-worker
 

dev/docker-compose.yaml

@@ -14,6 +14,8 @@ services:
       interval: 10s
       timeout: 5s
       retries: 3
+    ports:
+      - 5432
   backend:
     depends_on:
       postgresdb:
@@ -67,7 +69,7 @@ services:
       - BACKEND_API_URI=http://backend
       - SLEEP_DURATION=5m
       - TASK_WORKER_IMAGE=mirrors-qa-task-worker
-      - TEST_FILE_URL=https://download.kiwix.org/zim/wikipedia/wikipedia_guw_all_nopic_2023-02.zim
+      - TEST_FILE_PATH=/zim/wikipedia/wikipedia_guw_all_nopic_2023-02.zim
     command: mirrors-qa-manager --verbose ${WORKER_ID}
   task-worker:
     build: