scripts/release: update env var for GHA (#364)

* scripts/release: update env var for GHA

* scripts/release: use short branch name
diff --git a/scripts/release/release.sh b/scripts/release/release.sh
index 6af7aed..10dec33 100755
--- a/scripts/release/release.sh
+++ b/scripts/release/release.sh
@@ -72,7 +72,7 @@
       git tag -a -m "v${TARGET_VERSION}" -s "v${TARGET_VERSION}"
   fi
 
-  git push origin "${CIRCLE_BRANCH}"
+  git push origin "${GITHUB_REF_NAME}"
   git push origin "v${TARGET_VERSION}"
 }