Add an item to the CVE issue template which calls for drafting the
security advisory early in the security incident handling process. The
intention is to ensure there is enough time to review and polish ISC
security advisories before they get published.
Tweak the release checklist to make sure we carefully consider all
confidential issues before opening them up to the public. This change
is intended as a safeguard against accidentally disclosing too much
information about a security vulnerability before our users get a chance
to patch it.
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