Add dockerignore to avoid copying Docker related files inside image

.dockerignore

@@ -0,0 +1,2 @@
+Dockerfile
+.dockerignore

Dockerfile

@@ -34,10 +34,10 @@ RUN apt-get update && \
         wget \
         && apt-get clean
 
-COPY vmg8825_b50b_release /home/builder/openwrt
+COPY . /home/builder/openwrt
 RUN useradd -m -s /bin/bash builder
 RUN chown -R builder:builder /home/builder/openwrt
 USER builder
-WORKDIR /home/builder
+WORKDIR /home/builder/openwrt
 
 CMD ["/bin/bash"]