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apt-key: remove carriage returns from armored keyrings before dearmoring

Kenyon Ralph requested to merge kenyon-guest/apt:apt-key-handle-crlf-keyrings into main

Without this, the awk script returns nothing if the armored keyring uses Windows/DOS-style CRLF line endings (since awk is designed for processing Unix text files). This would result in a NO_PUBKEY error during the signature verification part of an apt-get update.

Sometimes armored keyrings are distributed as DOS format text files, as has been reported in https://github.com/jfrog/jfrog-cli/issues/1741 and https://github.com/yarnpkg/yarn/issues/8566.

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