Initial commit with support for GitHub actions

example/.github/main.workflow

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+workflow "build-and-deploy" {
+  on = "push"
+  resolves = ["deploy"]
+}
+
+action "build" {
+  uses = "./action1"
+  args = "echo 'build'"
+}
+
+action "test" {
+  uses = "docker://ubuntu:18.04"
+  args = "echo 'test'"
+  needs = ["build"]
+}
+
+action "deploy" {
+  uses = "./action2"
+  args = "echo 'deploy'"
+  needs = ["test"]
+}

example/action1/Dockerfile

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+FROM ubuntu:18.04

example/action2/Dockerfile

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+FROM alpine:3.8