fix docker volume read/write permission

scripts/run-docker.sh

@@ -1,9 +1,12 @@
 #!/bin/sh
 set -e -u
 
+HOME=/home/builder
 IMAGE_NAME=termux/package-builder
 CONTAINER_NAME=termux-package-builder
 
+[ `id -u` -eq 0 ] && USER=root || USER=builder
+
 echo "Running container '$CONTAINER_NAME' from image '$IMAGE_NAME'..."
 
 docker start $CONTAINER_NAME > /dev/null 2> /dev/null || {
@@ -14,12 +17,17 @@ docker start $CONTAINER_NAME > /dev/null 2> /dev/null || {
 	       --volume $PWD:/home/builder/termux-packages \
 	       --tty \
 	       $IMAGE_NAME
+
+	echo "Changed builder uid/gid..."
+	docker exec $CONTAINER_NAME chown -R `id -u` /data >& /dev/null
+	docker exec $CONTAINER_NAME usermod -u `id -u` builder >& /dev/null
+	docker exec $CONTAINER_NAME groupmod -g `id -g` builder >& /dev/null
 }
 
 if [ "$#" -eq  "0" ]; then
-	docker exec --interactive --tty --user builder $CONTAINER_NAME bash
+	docker exec --interactive --tty --user $USER $CONTAINER_NAME bash
 else
-	docker exec --interactive --tty --user builder $CONTAINER_NAME $@
+	docker exec --interactive --tty --user $USER $CONTAINER_NAME $@
 fi