feat: Add "coder" CLI (#221)

* feat: Add "coder" CLI

* Add CLI test for login

* Add "bin/coder" target to Makefile

* Update promptui to fix race

* Fix error scope

* Don't run CLI tests on Windows

* Fix requested changes

cli/login_test.go

@@ -0,0 +1,56 @@
+//go:build !windows
+
+package cli_test
+
+import (
+	"testing"
+
+	"github.com/coder/coder/cli/clitest"
+	"github.com/coder/coder/coderd/coderdtest"
+	"github.com/stretchr/testify/require"
+
+	"github.com/Netflix/go-expect"
+)
+
+func TestLogin(t *testing.T) {
+	t.Parallel()
+	t.Run("InitialUserNoTTY", func(t *testing.T) {
+		t.Parallel()
+		client := coderdtest.New(t)
+		root, _ := clitest.New(t, "login", client.URL.String())
+		err := root.Execute()
+		require.Error(t, err)
+	})
+
+	t.Run("InitialUserTTY", func(t *testing.T) {
+		t.Parallel()
+		console, err := expect.NewConsole(expect.WithStdout(clitest.StdoutLogs(t)))
+		require.NoError(t, err)
+		client := coderdtest.New(t)
+		root, _ := clitest.New(t, "login", client.URL.String())
+		root.SetIn(console.Tty())
+		root.SetOut(console.Tty())
+		go func() {
+			err := root.Execute()
+			require.NoError(t, err)
+		}()
+
+		matches := []string{
+			"first user?", "y",
+			"username", "testuser",
+			"organization", "testorg",
+			"email", "user@coder.com",
+			"password", "password",
+		}
+		for i := 0; i < len(matches); i += 2 {
+			match := matches[i]
+			value := matches[i+1]
+			_, err = console.ExpectString(match)
+			require.NoError(t, err)
+			_, err = console.SendLine(value)
+			require.NoError(t, err)
+		}
+		_, err = console.ExpectString("Welcome to Coder")
+		require.NoError(t, err)
+	})
+}