Deploy formulae.brew.sh changes with Actions

Try using GitHub Actions to replace https://github.com/Homebrew/homebrew-core/blob/master/.travis.yml

.github/formulae.brew.sh.workflow

@@ -0,0 +1,15 @@
+workflow "formulae.brew.sh generation" {
+  on = "push"
+  resolves = ["Filters for GitHub Actions"]
+}
+
+action "Master" {
+  uses = "actions/bin/filter@master"
+  args = "branch master"
+}
+
+action "Shell" {
+  needs = "Master"
+  uses = "actions/bin/sh@master"
+  args = ["git clone --depth=1 https://github.com/Homebrew/brew "$HOMEBREW_REPOSITORY""]
+}