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Increase nginx proxy_buffers size

Administrator requested to merge bl/saml-debug into master

Created by: beyang

Increase the nginx proxy buffers, which effectively limit the size of a HTTP response from Sourcegraph. This fixes an issue where SAML login would fail, because the HTTP redirect, which included the URL-encoded SAML assertion, exceeded the proxy buffer size.

$CUSTOMER ran into this after configuring SAML login with encryption (via the serviceProviderCertificate and serviceProviderPrivateKey fields).

This PR also includes some changes to CI to fix bugs in the docker-images-patch-notest/server case.

Post-merge TODO:

  • Cherry-pick this into 3.5
  • Update deploy-sourcegraph nginx ConfigMap

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