Fix automatic upgrade

upgrade-entrypoint.sh

@@ -11,15 +11,18 @@ if [ -f "$OLD_VERSION_FILE" ]; then
     if [ "$OLD_VERSION" != "$NEW_VERSION" ]; then
         echo "Data version ($OLD_VERSION) differs from engine ($NEW_VERSION). Starting upgrade..."
         
-        # 1. Move old data to a temporary folder
+        # Move old data to a temporary folder
         mkdir -p $DATA_DIR/old_data
         mv $DATA_DIR/* $DATA_DIR/old_data/ || true
         
-        # 2. Initialize new data directory
+        # Initialize new data directory
 				mkdir $DATA_DIR/new_data
         initdb -D $DATA_DIR/new_data
+
+				# Prevent error "You must have read and write access in the current directory."
+				cd $DATA_DIR
         
-        # 3. Run pg_upgrade
+        # Run pg_upgrade
         # --link is used to avoid copying files (fast, but requires a backup!)
         pg_upgrade \
             -d $DATA_DIR/old_data \
@@ -27,7 +30,8 @@ if [ -f "$OLD_VERSION_FILE" ]; then
             -b /usr/bin/postgres-16 \
             -B /usr/local/bin \
             --link
-            
+        
+				# Clean-up
         echo "Upgrade complete. Cleaning up..."
         rm -rf $DATA_DIR/old_data
 				mv $DATA_DIR/new_data/* $DATA_DIR/