fix(post_action): replace head with sed for removing last line

	•	Replaced head --lines=-1 with sed '$ d' to remove the last line from SSH_KNOWN_HOSTS_FILE.
	•	Ensured compatibility and consistency in processing the known_hosts file.
	•	Simplified command usage while maintaining functionality.

Author: warnyul

post_action.sh

@@ -3,7 +3,7 @@
 SSH_KNOWN_HOSTS_FILE="${HOME}/.ssh/known_hosts"
 TEMP_FILE="/tmp/718f4157-5493-43b2-837b-3ccb27f78e7b"
 
-head --lines=-1 "${SSH_KNOWN_HOSTS_FILE}" > "${TEMP_FILE}"
+sed '$ d' file "${SSH_KNOWN_HOSTS_FILE}" > "${TEMP_FILE}"
 cat "${TEMP_FILE}" > "${SSH_KNOWN_HOSTS_FILE}"
 rm -rf "${TEMP_FILE}"