Fix very first "eturnalctl daemon" startup

On Erlang/OTP 23 and newer, the very first "eturnalctl daemon" startup
hangs due to a missing Erlang cookie file.  Work around this issue until
it's fixed:

erlware/relx#905

CHANGELOG.md

@@ -7,6 +7,8 @@ project adheres to [Semantic Versioning][SemVer].
 ### Fixed
 - Avoid permission issues in the case where `eturnalctl` was invoked by root
   from a directory the user running eturnal isn't permitted to change into.
+- Make sure `eturnalctl daemon` won't hang on the very first startup when using
+  Erlang/OTP 23 or newer.
 
 ## [1.9.1] - 2022-07-17
 ### Added

scripts/hooks/pre_start

@@ -2,3 +2,14 @@ if ! [ -e "$ETURNAL_ETC_PREFIX/etc/eturnal.yml" ]
 then
     export ETURNAL_ETC_PREFIX="$RELEASE_ROOT_DIR"
 fi
+
+# Until https://github.com/erlware/relx/issues/905 is fixed:
+if [ -z "$COOKIE" ]
+then
+    "$ERTS_DIR/bin/erl" \
+        -noinput \
+        -boot 'no_dot_erlang' \
+        -sname 'cookie' \
+        -eval 'halt()' \
+        2>'/dev/null' || :
+fi