build ARM Docker image

Author: joonas-fi

Dockerfile

@@ -1,5 +1,8 @@
 FROM alpine:latest
 
+# "amd64" | "arm" | ...
+ARG TARGETARCH
+
 # using host's filesystem boosts performance. it is expected that the user uses this as anonymous
 # volume (i.e. nothing specific has to be done) for this to get cleaned up
 VOLUME /var/cache/edgerouter
@@ -10,4 +13,4 @@ CMD ["serve"]
 
 COPY bin/deploy-turbocharger-site.sh /usr/bin/
 
-COPY rel/edgerouter_linux-amd64 /usr/bin/edgerouter
+COPY "rel/edgerouter_linux-$TARGETARCH" /usr/bin/edgerouter

turbobob.json

@@ -37,7 +37,8 @@
 	"docker_images": [
 		{
 			"image": "fn61/edgerouter",
-			"dockerfile_path": "Dockerfile"
+			"dockerfile_path": "Dockerfile",
+			"platforms": ["linux/amd64", "linux/arm/v7"]
 		}
 	]
 }