VPN: orginize nebula code
diff --git a/core/nebula/Dockerfile b/core/nebula/Dockerfile
new file mode 100644
index 0000000..8377bdd
--- /dev/null
+++ b/core/nebula/Dockerfile
@@ -0,0 +1,8 @@
+FROM alpine:latest
+
+RUN wget https://github.com/slackhq/nebula/releases/download/v1.4.0/nebula-linux-arm64.tar.gz -O nebula.tar.gz
+RUN tar -xvf nebula.tar.gz
+RUN mv nebula /usr/bin
+RUN mv nebula-cert /usr/bin
+RUN chmod +x /usr/bin/nebula
+RUN chmod +x /usr/bin/nebula-cert