Add the ability to edit remote directories over SSH (#14530)

This is a first step towards allowing you to edit remote projects
directly over SSH. We'll start with a pretty bare-bones feature set, and
incrementally add further features.

### Todo

Distribution
* [x] Build nightly releases of `zed-remote-server` binaries
    * [x] linux (arm + x86)
    * [x] mac (arm + x86)
* [x] Build stable + preview releases of `zed-remote-server`
* [x] download and cache remote server binaries as needed when opening
ssh project
* [x] ensure server has the latest version of the binary


Auth
* [x] allow specifying password at the command line
* [x] auth via ssh keys
* [x] UI password prompt

Features
* [x] upload remote server binary to server automatically
* [x] opening directories
* [x] tracking file system updates
* [x] opening, editing, saving buffers
* [ ] file operations (rename, delete, create)
* [ ] git diffs
* [ ] project search

Release Notes:

- N/A

---------

Co-authored-by: Piotr Osiewicz <24362066+osiewicz@users.noreply.github.com>

.github/workflows/release_nightly.yml

@@ -33,6 +33,7 @@ jobs:
 
       - name: Run clippy
         run: ./script/clippy
+
   tests:
     timeout-minutes: 60
     name: Run tests
@@ -90,6 +91,9 @@ jobs:
       - name: Create macOS app bundle
         run: script/bundle-mac
 
+      - name: Build macOS remote server binaries
+        run: script/build-remote-server x86_64 aarch64
+
       - name: Upload Zed Nightly
         run: script/upload-nightly macos