docs: add a note about how our build reports are persisted

airbyte-integrations/builds-readme.md

@@ -0,0 +1,6 @@
+# How is the builds page generated? 
+[This github action](https://github.com/airbytehq/airbyte/blob/master/.github/workflows/connector_integration_tests.yml) runs once a day. 
+It triggers builds for all connectors. The result of this build is persisted on an S3 bucket in our AWS dev environment. 
+Ask for access rights from the Airbyte team if you need it to access the environment. This S3 bucket is hooked up to a CDN, AWS CloudFront. 
+Then, [this Github action](https://github.com/airbytehq/airbyte/blob/master/.github/workflows/build-report.yml) reads from Cloudfront to send a daily
+Slack message informing us of the build status of any connectors in need of attention.