.github/workflows: rename release.yml -> release-nightly.yml

Change-Id: Idfbb7c2c29162d0e1c608bb8fa016647488f470a
Reviewed-on: https://go-review.googlesource.com/c/vscode-go/+/239282
Reviewed-by: Rebecca Stambler <rstambler@golang.org>
diff --git a/.github/workflows/release.yml b/.github/workflows/release-nightly.yml
similarity index 100%
rename from .github/workflows/release.yml
rename to .github/workflows/release-nightly.yml