add tests for various actions

actions/testdata/action1/Dockerfile

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+FROM ubuntu:18.04

actions/testdata/action2/Dockerfile

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+FROM alpine:3.8

actions/testdata/basic.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"
+  runs = ["/bin/sh", "-c", "cat $GITHUB_EVENT_PATH"]
+  needs = ["test"]
+}

actions/testdata/fail.workflow

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+workflow "test" {
+  on = "push"
+  resolves = ["test-action"]
+}
+
+action "test-action" {
+  uses = "docker://alpine:3.9"
+  runs = ["sh", "-c", "echo $IN | grep $OUT"]
+  env = {
+    IN = "foo"
+    OUT = "bar"
+  }
+}

actions/testdata/pipe.workflow

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+workflow "test" {
+  on = "push"
+  resolves = ["test-action"]
+}
+
+action "test-action" {
+  uses = "docker://alpine:3.9"
+  runs = ["sh", "-c", "echo $IN | grep $OUT"]
+  env = {
+    IN = "foo"
+    OUT = "foo"
+  }
+}

actions/testdata/regex.workflow

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+workflow "New workflow" {
+  on = "push"
+  resolves = ["filter-version-before-deploy"]
+}
+
+action "filter-version-before-deploy" {
+  uses = "actions/bin/filter@master"
+  args = "tag z?[0-9]+\\.[0-9]+\\.[0-9]+"
+}