[circle] fix apt issues
[circle] fix apt issues

Summary: we use a debian jessie image for the linux build because using an old version of libc is more widely compatible. apparently debian archived jessie, so we have to update the list of sources to get apt to work. see link in the code comment

Reviewed By: panagosg7

Differential Revision: D14704068

fbshipit-source-id: 71dfdfa8fdebbdd4f440587558c026180f423dd8

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