Build multi-arch container images across stack
diff --git a/core/nebula/Dockerfile b/core/nebula/Dockerfile
index 8377bdd..5f8d825 100644
--- a/core/nebula/Dockerfile
+++ b/core/nebula/Dockerfile
@@ -1,6 +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
+ARG TARGETARCH
+
+RUN wget https://github.com/slackhq/nebula/releases/download/v1.4.0/nebula-linux-${TARGETARCH}.tar.gz -O nebula.tar.gz
RUN tar -xvf nebula.tar.gz
RUN mv nebula /usr/bin
RUN mv nebula-cert /usr/bin