Fix root user check on alpine

Author: reimda

telegraf/1.18/alpine/entrypoint.sh

@@ -5,7 +5,7 @@ if [ "${1:0:1}" = '-' ]; then
     set -- telegraf "$@"
 fi
 
-if [ $EUID -ne 0 ]; then
+if [ "$(id -u)" -ne 0 ]; then
     exec "$@"
 else
     exec su-exec telegraf "$@"

telegraf/1.19/alpine/entrypoint.sh

@@ -5,7 +5,7 @@ if [ "${1:0:1}" = '-' ]; then
     set -- telegraf "$@"
 fi
 
-if [ $EUID -ne 0 ]; then
+if [ "$(id -u)" -ne 0 ]; then
     exec "$@"
 else
     exec su-exec telegraf "$@"

telegraf/1.20/alpine/entrypoint.sh

@@ -5,7 +5,7 @@ if [ "${1:0:1}" = '-' ]; then
     set -- telegraf "$@"
 fi
 
-if [ $EUID -ne 0 ]; then
+if [ "$(id -u)" -ne 0 ]; then
     exec "$@"
 else
     exec su-exec telegraf "$@"