Use "release" event instead of "push"

.github/main.workflow

@@ -1,13 +1,14 @@
 workflow "Release" {
-  on = "push"
   resolves = [
     "Trigger GitHub release",
+    "Is version tag",
   ]
+  on = "release"
+}
 
-  # GitHub actions are too slow for this, it takes more than 15 mins.
+action "Is version tag" {
-  # Publishing to npm from GH actions is a cool idea, but it's a lot faster to
+  uses = "actions/bin/filter@0dbb077f64d0ec1068a644d25c71b1db66148a24"
-  # publish locally.
+  args = "tag v*"
-  # "Publish to npm",
 }
 
 action "Trigger GitHub release" {
@@ -17,45 +18,14 @@ action "Trigger GitHub release" {
     COMMIT_AUTHOR_NAME = "Babel Bot"
     COMMIT_AUTHOR_EMAIL = "babel-bot@users.noreply.github.com"
   }
-  needs = ["Create release tag"]
-}
-
-action "Publish to npm" {
-  uses = "docker://node:10"
-  secrets = ["NPM_TOKEN"]
-  runs = "make"
-  args = "publish-ci"
-  env = {
-    CI = "true"
-  }
-  needs = ["Create release tag"]
-}
-
-# When GitHub Actions will support the "release" event for public
-# repositories, we won't need this checks anymore.
-action "Create release tag" {
-  uses = "./.github/actions/create-release-tag"
   needs = [
-    "Is version commit",
+    "Is version tag",
-    "On master branch",
   ]
 }
 
-action "Is version commit" {
-  uses = "./.github/actions/filter-commit-message"
-  # This regex is run using "grep -P".
-  # The (-\\S+) part is for 7.0.0-beta.1 releases.
-  args = "^v(\\d+\\.){2}\\d+(-\\S+)?$"
-}
-
-action "On master branch" {
-  uses = "actions/bin/filter@master"
-  args = "branch master"
-}
-
 workflow "Welcome comment" {
-  on = "issues"
   resolves = ["Create Comment"]
+  on = "issues"
 }
 
 action "Is action 'opened'" {