Fix failing build quay.io/m3db error

[kentzeng12]

There is a failing test in our buildkite pipeline called build quay.io/m3db.

Example build: https://buildkite.com/uberopensource/m3-monorepo-ci-uber-oss/builds/351

It is not part of our buildkite pipeline steps. The error message says No docker-login password found in $QUAY_M3DB_TOKEN.

This issue does not appear when making a PR. For example, the PR for the example build from above has all pipeline tests passing: https://github.com/m3db/m3/pull/4286. The issue only occurs when the PR is merged to master, and the buildkite pipeline is re run.