Remove nsswitch.conf creation

Since 11-11-2022, the alpine:3.16 now includes that file on its
base image. More information can be found at:
https://git.alpinelinux.org/aports/commit/?id=348653a9ba0701e8e968b3344e72313a9ef334e4

Signed-off-by: Paulo Gomes <paulo.gomes@weave.works>

Author: Paulo Gomes

Dockerfile

@@ -39,10 +39,6 @@ RUN apk add --no-cache ca-certificates tini
 
 COPY --from=builder /workspace/notification-controller /usr/local/bin/
 
-# Create minimal nsswitch.conf file to prioritize the usage of /etc/hosts over DNS queries.
-# https://github.com/gliderlabs/docker-alpine/issues/367#issuecomment-354316460
-RUN [ ! -e /etc/nsswitch.conf ] && echo 'hosts: files dns' > /etc/nsswitch.conf
-
 USER 65534:65534
 
 ENTRYPOINT [ "/sbin/tini", "--", "notification-controller" ]