Have the CI server draft the release notes (#10700)

While I don't expect these to be useful for our weekly minor releases, I
hope that this will save a step for people doing mid-week patches.

Release Notes:

- N/A

.github/workflows/ci.yml

@@ -205,6 +205,7 @@ jobs:
             echo "invalid release tag ${GITHUB_REF_NAME}. expected ${expected_tag_name}"
             exit 1
           fi
+          script/draft-release-notes "$version" "$channel" > target/release-notes.md
 
       - name: Generate license file
         run: script/generate-licenses
@@ -248,7 +249,7 @@ jobs:
             target/aarch64-apple-darwin/release/Zed-aarch64.dmg
             target/x86_64-apple-darwin/release/Zed-x86_64.dmg
             target/release/Zed.dmg
-          body: ""
+          body_file: target/release-notes.md
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}