Add entry to CHANGELOG.md

Author: tlinhart

CHANGELOG.md

@@ -2,6 +2,7 @@
 
 * [5392](https://github.com/grafana/loki/pull/5392) **MichelHollands**: Etcd credentials are parsed as secrets instead of plain text now.
 * [5361](https://github.com/grafana/loki/pull/5361) **ctovena**: Add usage report to grafana.com.
+* [5354](https://github.com/grafana/loki/pull/5354) **tlinhart**: Add support for ARM64 to lambda-promtail drone build job.
 * [5289](https://github.com/grafana/loki/pull/5289) **ctovena**: Fix deduplication bug in queries when mutating labels.
 * [5302](https://github.com/grafana/loki/pull/5302) **MasslessParticle** Update azure blobstore client to use new sdk.
 * [5243](https://github.com/grafana/loki/pull/5290) **ssncferreira**: Update Promtail to support duration string formats.