feat: Add templates to create working release (#422)

* Add templates

* Move API structs to codersdk

* Back to green tests!

* It all works, but now with tea! 🧋

* It works!

* Add cancellation to provisionerd

* Tests pass!

* Add deletion of workspaces and projects

* Fix agent lock

* Add clog

* Fix linting errors

* Remove unused CLI tests

* Rename daemon to start

* Fix leaking command

* Fix promptui test

* Update agent connection frequency

* Skip login tests on Windows

* Increase tunnel connect timeout

* Fix templater

* Lower test requirements

* Fix embed

* Disable promptui tests for Windows

* Fix write newline

* Fix PTY write newline

* Fix CloseReader

* Fix compilation on Windows

* Fix linting error

* Remove bubbletea

* Cleanup readwriter

* Use embedded templates instead of serving over API

* Move templates to examples

* Improve workspace create flow

* Fix Windows build

* Fix tests

* Fix linting errors

* Fix untar with extracting max size

* Fix newline char

coderd/tunnel/tunnel_test.go

@@ -0,0 +1,53 @@
+package tunnel_test
+
+import (
+	"context"
+	"net"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/require"
+	"golang.org/x/xerrors"
+
+	"github.com/coder/coder/coderd/tunnel"
+)
+
+// The tunnel leaks a few goroutines that aren't impactful to production scenarios.
+// func TestMain(m *testing.M) {
+// 	goleak.VerifyTestMain(m)
+// }
+
+func TestTunnel(t *testing.T) {
+	t.Parallel()
+	if testing.Short() {
+		t.Skip()
+		return
+	}
+
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.WriteHeader(http.StatusOK)
+	}))
+	t.Cleanup(srv.Close)
+
+	ctx, cancelFunc := context.WithCancel(context.Background())
+	defer cancelFunc()
+	url, _, err := tunnel.New(ctx, srv.URL)
+	require.NoError(t, err)
+	t.Log(url)
+
+	require.Eventually(t, func() bool {
+		req, err := http.NewRequestWithContext(ctx, "GET", url, nil)
+		require.NoError(t, err)
+		res, err := http.DefaultClient.Do(req)
+		var dnsErr *net.DNSError
+		// The name might take a bit to resolve!
+		if xerrors.As(err, &dnsErr) {
+			return false
+		}
+		require.NoError(t, err)
+		defer res.Body.Close()
+		return res.StatusCode == http.StatusOK
+	}, 5*time.Minute, 3*time.Second)
+}