add first github action! (#891)

* add first github action!

* Update main.workflow

.github/main.workflow

@@ -0,0 +1,35 @@
+workflow "build, test and publish on release" {
+  on = "release"
+  resolves = "publish"
+}
+
+# install with yarn
+action "install" {
+  uses = "actions/[email protected]"
+  runs = "yarn"
+  args = "install"
+}
+
+# build with yarn
+action "build" {
+  needs = "install"
+  uses = "actions/[email protected]"
+  runs = "yarn"
+  args = "build"
+}
+
+# test with yarn
+action "test" {
+  needs = "build"
+  uses = "actions/[email protected]"
+  runs = "yarn"
+  args = "test"
+}
+
+# publish with npm
+action "publish" {
+  needs = "test"
+  uses = "actions/[email protected]"
+  args = "publish"
+  secrets = ["NPM_AUTH_TOKEN"]
+}