Add build instructions

README.md

@@ -15,6 +15,18 @@ To test:
 poetry run pytest
 ```
 
+To build and deploy:
+
+- commit changes to rc-release branch
+- then run
+```
+docker buildx bake --set '*.platform=linux/amd64' -f docker-compose.yml --no-cache --load
+cd ../ranking-challenge-submission
+poetry run python push_to_ecr.py --team perspective
+```
+- manual "update service" on prod-prc-perspective-app-service in AWS
+- PERSPECTIVE_API_KEY and PERSPECTIVE_HOST need to be set in ECS task definition
+
 ## API Key
 
 You'll need a Perspective API key, which should be in the `PERSPECTIVE_API_KEY` environment variable. You can put it in `.env` for local use.