Add missing erlang deps

cavemandaveman · tianon · commit 6323c9392279 · 2017-01-26T15:22:10.000-08:00
diff --git a/alpine/Dockerfile b/alpine/Dockerfile
@@ -19,7 +19,9 @@ RUN apk add --no-cache \
 		erlang \
 		erlang-os-mon \
 		erlang-public-key \
+		erlang-sasl \
 		erlang-ssl \
+		erlang-syntax-tools \
 		erlang-xmerl
 
 # get logs to stdout (thanks @dumbbell for pushing this upstream! :D)
