add(docker): added support for __FILE suffix in docker

Author: cethien

scripts/entrypoint.sh

@@ -18,6 +18,19 @@ if [ "${PUID}" != "0" ] || [ "${PGID}" != "0" ]; then
     echo "Changing owner to $PUID:$PGID, done."
 fi
 
+# support __FILE Suffix for environment variables
+for file_var in $(env | grep '__FILE='); do
+    target_var=$(echo "$file_var" | cut -d'=' -f1 | sed 's/__FILE//')
+    file_path=$(echo "$file_var" | cut -d'=' -f2)
+
+    if [ -f "$file_path" ]; then
+        export "$target_var"=$(cat "$file_path" | tr -d '\n\r')
+        echo "Info: Loaded secret for $target_var from $file_path"
+    else
+        echo "Warning: Secret file $file_path not found for $target_var"
+    fi
+done
+
 if [ "${PUID}" != "0" ]; then
     exec su-exec $PUID:$PGID "$@"
 else