Sync-in: use heredoc for credentials file, matching repo convention

install/sync-in-install.sh

@@ -53,12 +53,12 @@ msg_info "Creating Admin User"
 cd /opt/sync-in
 ADMIN_PASS=$(openssl rand -base64 18)
 $STD npx sync-in-server create-user --role admin --login admin --password "${ADMIN_PASS}"
-{
-  echo "Sync-in Credentials"
-  echo "===================="
-  echo "Login: admin"
-  echo "Password: ${ADMIN_PASS}"
-} >~/sync-in.creds
+cat <<EOF >~/sync-in.creds
+Sync-in Credentials
+====================
+Login: admin
+Password: ${ADMIN_PASS}
+EOF
 msg_ok "Created Admin User"
 
 VERSION=$(node -pe "require('/opt/sync-in/node_modules/@sync-in/server/package.json').version" 2>/dev/null || echo "")