improve gitleaks / handle-secrets function

- fix missing new-line at the beginning when dealing with pre-existing content
- add gitleaks 8.20.0 feature to decode base64 value during scan for inspection

stow/shell/.config/bash/functions

@@ -209,8 +209,9 @@ function handle-secrets {
 	echo "Scanning: ${target_directory}"
 	if [[ -f "${target_directory}/.gitleaksignore" ]]; then
 		ignore_file_contents=$(< "${target_directory}/.gitleaksignore")
+		ignore_file_contents+="\n"
 	fi
-	gitleaks git --verbose --report-format=json --report-path="${report_file}" --exit-code=0 "${target_directory}" &>/dev/null
+	gitleaks git --verbose --report-format=json --report-path="${report_file}" --max-decode-depth 1 --exit-code=0 "${target_directory}" &>/dev/null
 
 	if [[ -f ${report_file} ]]; then
 		if [[ $(jq length "${report_file}") == 0 ]]; then