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This is so if you need additional components for your build, they can be made available. For example, if you wanted thirdparty/ceph-reef available, you would set `EXTRACOMPONENTS` to `thirdparty/ceph-reef` in CI. This works by setting up an apt .sources file that looks like: ``` Types: deb URIs: http://apt.wikimedia.org/wikimedia Suites: ${SUITE}-wikimedia Signed-By: /etc/apt/keyrings/wikimedia-archive-keyring.gpg Components: ${EXTRACOMPONENTS} ```
