arm64 support in nri-statsd image

[josemore]

gostatsd image is available for [arm64](docker pull atlassianlabs/gostatsd:latest)

• [x] Add support for nri-statsd arm64 in the build / publish script
• [x] Validate
• [x] Publish
• [ ] Docs update

---

UPDATE

• Tested with https://hub.docker.com/r/ohaiops/rruizdegauna-nri-statsd in amd64 and arm64

docker run \
  -d ${RM} \
  --name newrelic-statsd \
  -h $(hostname) \
  -e NR_ACCOUNT_ID=$ACCOUNT \
  -e NR_API_KEY=$LICENSE \
  -v /root/sock:/root/sock \
  -e TAGS="arch:arm64" \
  -e NR_INSIGHTS_COLLECTOR=$NR_INSIGHTS_COLLECTOR \
  -e NR_METRICS_COLLECTOR=$NR_METRICS_COLLECTOR \
  -e NR_STATSD_METRICS_ADDR=/root/sock/newrelic-statsd.socket \
  ohaiops/rruizdegauna-nri-statsd

root@ip-10-10-0-23:~# docker ps
CONTAINER ID   IMAGE                             COMMAND            CREATED          STATUS          PORTS     NAMES
d2cceb9aeb10   ohaiops/rruizdegauna-nri-statsd   "/nri-statsd.sh"   43 seconds ago   Up 41 seconds             newrelic-statsd
root@ip-10-10-0-23:~# uname -a
Linux ip-10-10-0-23 5.4.0-1048-aws #50-Ubuntu SMP Mon May 3 21:42:45 UTC 2021 aarch64 aarch64 aarch64 GNU/Linux