CircleCI config tweaks (#1116)

* update ci files

* remove redundant build step

- npm run package:* also builds

* fix path to temp aws files

* include exe in windows build

* add release notes reference

* tweak ghr draft tag name

* remove test filtering

* ignore tags for build_linux

* don't try to use the tag

Co-authored-by: Guillermo Vayá <guivaya@gmail.com>

scripts/generate_release_markdown.sh

@@ -15,7 +15,10 @@ VERSION="$1" # such as 3.7.1, 4.0.0-rc1
 BASE_URL="https://releases.mattermost.com/desktop/${VERSION}"
 
 cat <<-MD
-### Mattermost Desktop ${VERSION} has been cut!
+### Mattermost Desktop v${VERSION} has been cut!
+
+Release notes can be found here: https://docs.mattermost.com/help/apps/desktop-changelog.html
+
 The download links can be found below.
 
 #### Windows - msi files (beta)