chore: [REL-4161] dont bomb out if ssh dir exists (#555)

Homebrew formula was updated successfully! The GHA bombed out on an
unrelated (and easily fixed) problem where the `~/.ssh` folder already
existed, but we tried to create it. Just need a `-p` there and we should
be good to go. I think this may _actually_ be the last one!

Note: According to cursor, Goreleaser will either compare the binaries
of the homebrew formula and determine that they are identical and skip
the release, OR it will overwrite the homebrew formula with the new one
(which is really just the same one). So in either case, we should be
good to go there. I don't expect any weirdness. The rest of the action
is idempotent, but it didn't run yet anyway, so no worries there either.
<!-- ld-jira-link -->
---
Related Jira issue: [REL-4161: Migrate ld-find-code-refs from Releaser
to GHA](https://launchdarkly.atlassian.net/browse/REL-4161)
<!-- end-ld-jira-link -->

Author: blaqbern

scripts/release/publish.sh

@@ -6,7 +6,8 @@ source $(dirname $0)/stage-artifacts.sh
 stage_artifacts publish
 
 # make bitbucket and github known hosts to push successfully
-mkdir -m700 ~/.ssh
+mkdir -p ~/.ssh
+chmod 700 ~/.ssh
 touch ~/.ssh/known_hosts
 chmod 644 ~/.ssh/known_hosts
 ssh-keyscan -t rsa bitbucket.org >> ~/.ssh/known_hosts