tweak script

Author: Will Fleming

bin/build

@@ -6,6 +6,7 @@ IMAGE_TAG="$1"
 
 DIR=$( cd "$( dirname "${0}" )" && pwd )
 SRC_ROOT=$( cd "$DIR/.." && pwd )
+cd "$SRC_ROOT"
 
 BUILD_SCRIPT="cd /src && "\
 "go get -t -d -v ./... && "\
@@ -14,4 +15,4 @@ BUILD_SCRIPT="cd /src && "\
 
 docker run -v "$SRC_ROOT:/src" yunspace/alpine-golang /bin/sh -c "$BUILD_SCRIPT"
 
-docker build -t $IMAGE_TAG $SRC_ROOT
+docker build -t "$IMAGE_TAG" .