### Merged Pull Requests
- add aarch64-darwin (M1) to release pipeline and curlbash install [#8346](https://github.com/habitat-sh/habitat/pull/8346) ([mwrock](https://github.com/mwrock)) <!-- 1.6.416 -->
- whitespace change to force release [#8345](https://github.com/habitat-sh/habitat/pull/8345) ([mwrock](https://github.com/mwrock)) <!-- 1.6.415 -->
- mac release root path should fall back to /hab [#8344](https://github.com/habitat-sh/habitat/pull/8344) ([mwrock](https://github.com/mwrock)) <!-- 1.6.414 -->
- search for nginx* process in e2e [#8343](https://github.com/habitat-sh/habitat/pull/8343) ([mwrock](https://github.com/mwrock)) <!-- 1.6.413 -->
- Bump pem from 1.0.0 to 1.0.1 [#8342](https://github.com/habitat-sh/habitat/pull/8342) ([dependabot[bot]](https://github.com/dependabot[bot])) <!-- 1.6.412 -->
- update e2e test to fix text mismatch [#8341](https://github.com/habitat-sh/habitat/pull/8341) ([pozsgaic](https://github.com/pozsgaic)) <!-- 1.6.411 -->
- Bump widestring from 0.5.0 to 0.5.1 [#8339](https://github.com/habitat-sh/habitat/pull/8339) ([dependabot[bot]](https://github.com/dependabot[bot])) <!-- 1.6.410 -->
- Enabling macos M1 hab cli build [#8334](https://github.com/habitat-sh/habitat/pull/8334) ([mwrock](https://github.com/mwrock)) <!-- 1.6.409 -->
- Bump libc from 0.2.104 to 0.2.105 [#8340](https://github.com/habitat-sh/habitat/pull/8340) ([dependabot[bot]](https://github.com/dependabot[bot])) <!-- 1.6.408 -->
- Bump libc from 0.2.103 to 0.2.104 [#8336](https://github.com/habitat-sh/habitat/pull/8336) ([dependabot[bot]](https://github.com/dependabot[bot])) <!-- 1.6.407 -->
- replace rants dependency with nats.io crate [#8293](https://github.com/habitat-sh/habitat/pull/8293) ([pozsgaic](https://github.com/pozsgaic)) <!-- 1.6.406 -->
- bump prost and friends [#8333](https://github.com/habitat-sh/habitat/pull/8333) ([mwrock](https://github.com/mwrock)) <!-- 1.6.405 -->
- Bump prost-derive from 0.8.0 to 0.9.0 [#8330](https://github.com/habitat-sh/habitat/pull/8330) ([dependabot[bot]](https://github.com/dependabot[bot])) <!-- 1.6.404 -->
- Bump pem from 0.8.3 to 1.0.0 [#8318](https://github.com/habitat-sh/habitat/pull/8318) ([dependabot[bot]](https://github.com/dependabot[bot])) <!-- 1.6.404 -->
- Bump widestring from 0.4.3 to 0.5.0 [#8329](https://github.com/habitat-sh/habitat/pull/8329) ([dependabot[bot]](https://github.com/dependabot[bot])) <!-- 1.6.403 -->
- Rustfmt and Nightly Rust Bump to nightly-2021-10-12 [#8327](https://github.com/habitat-sh/habitat/pull/8327) ([chef-expeditor[bot]](https://github.com/chef-expeditor[bot])) <!-- 1.6.402 -->
- update changelog for 1.6.400 [#8328](https://github.com/habitat-sh/habitat/pull/8328) ([mwrock](https://github.com/mwrock)) <!-- 1.6.401 -->