Use example from docs to fix GH Action (#295)

Author: CalemRoelofsSB

.github/action/entrypoint.sh

@@ -1,9 +1,9 @@
 #!/bin/sh
 output=$(/cli/bin/run $*); status=$?;
 
-delimiter="$(uuidgen)"
-echo "response<<${delimiter}" >> "${GITHUB_OUTPUT}"
-echo "${output}" >> "${GITHUB_OUTPUT}"
-echo "${delimiter}" >> "${GITHUB_OUTPUT}"
+EOF=$(dd if=/dev/urandom bs=15 count=1 status=none | base64)
+echo "response<<$EOF" >> $GITHUB_OUTPUT
+echo $output >> $GITHUB_OUTPUT
+echo "$EOF" >> $GITHUB_OUTPUT
 
 exit $status