To support konflux team that push ~2500 layers in an image.
quay/quay#3098: nginx: increasing keepalive timeout for manifests endpoint (PROJQUAY-7573)
quay/quay#3112: nginx: set proxy_read_timeout on manifests endpoint (PROJQUAY-7573)
quay/quay#3129: nginx: revert #3098 (PROJQUAY-7573)
Merge request - quayio-stage set MANIFESTS_ENDPOINT_KEEPALIVE_TIMEOUT
Merge request - quayio-stage setting manifest endopoint read timeout (PROJQUAY-7573)
Merge request - set manifests endpoint read timeout on quay.io production
Solved by commit b2639f9eb0412a9ccfb763b6fb3142df097caeba.