* CouchDB: generate an Erlang-safe (hex) cookie
ERLANG_COOKIE was generated with `openssl rand -base64 32`, whose output
contains +, / and = (e.g. "+w2dDazB/CrIZMsZu8edX4hn55QeRXOCi+hom25Lmm8=").
CouchDB writes the cookie into /opt/couchdb/etc/vm.args as
`-setcookie '<cookie>'`, and those characters break Erlang's vm.args
parsing, so couchdb.service fails to start on a fresh install (#16360).
Use `openssl rand -hex 32` instead: a 64-char hex string is alphanumeric,
needs no quoting, and is always a valid Erlang cookie. (Same 256-bit
entropy as the base64 of 32 bytes.)
Closes#16360
* Update install/apache-couchdb-install.sh
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Co-authored-by: Sam Heinz <sam@samheinz.com>
