docs: Add release command

Author: JadedBlueEyes

docs/RELEASING.md

@@ -5,3 +5,9 @@
 2. Tag and push the commit with the new version number. For example, `v0.3.4`
 3. Wait for the CI to complete. This will build Docker images and publish
    them to Docker Hub with the correct tags.
+
+This can be automated with this command:
+
+```
+cargo release <bump_level> --sign --no-publish --execute --verbose --push-remote upstream
+```