[local-preview] Warn and Confirm from user before proceeding

Currently, For Users with ARM CPU's, `local-preview` does not
really work and its hard for the script to know as it runs inside
docker (which could be a x86 VM).

This Updates the script to warn the users on the requirements before
starting and running `local-preview`.

Signed-off-by: Tarun Pothulapati <tarun@gitpod.io>

Author: Pothulapati

install/preview/prettylog/go.mod

@@ -3,10 +3,9 @@ module github.com/gitpod-io/gitpod/install/preview/prettylog
 go 1.18
 
 require (
-	github.com/atomicgo/cursor v0.0.1 // indirect
 	github.com/gookit/color v1.5.0 // indirect
 	github.com/mattn/go-runewidth v0.0.13 // indirect
-	github.com/pterm/pterm v0.12.41
+	github.com/pterm/pterm v0.12.42
 	github.com/rivo/uniseg v0.2.0 // indirect
 	github.com/xo/terminfo v0.0.0-20210125001918-ca9a967f8778 // indirect
 	golang.org/x/sys v0.0.0-20220319134239-a9b59b0215f8 // indirect
@@ -15,7 +14,12 @@ require (
 )
 
 require (
+	atomicgo.dev/cursor v0.1.1 // indirect
+	atomicgo.dev/keyboard v0.2.8 // indirect
 	github.com/bmizerany/assert v0.0.0-20160611221934-b7ed37b82869 // indirect
+	github.com/containerd/console v1.0.3 // indirect
+	github.com/lithammer/fuzzysearch v1.1.5 // indirect
 	github.com/segmentio/backo-go v1.0.1 // indirect
 	github.com/xtgo/uuid v0.0.0-20140804021211-a0b114877d4c // indirect
+	golang.org/x/text v0.3.7 // indirect
 )

install/preview/prettylog/go.sum

@@ -37,7 +37,33 @@ var (
 	}
 )
 
+// confirm from the user to continue
+func confirm() bool {
+	scanner := bufio.NewScanner(os.Stdin)
+	fmt.Print("Continue? [y|n]: ")
+	scanner.Scan()
+	input := strings.ToLower(scanner.Text())
+	// yes by default
+	if input == "y" || input == "yes" || input == "" {
+		return true
+	}
+	return false
+}
+
 func main() {
+	// Warn and wait for user approval
+	pterm.FgLightCyan.Println(`
+Welcome to the local preview of Gitpod. Please note the following limitations:
+  - Performance is limited by the capabilities of your machine - a minimum of 4 cores and 6GB of RAM are required
+  - ARM CPUs including Macs with Apple Silicon (e.g. M1) are currently not supported
+For more information about these limitation, please visit the local preview documentation: https://www.gitpod.io/docs/self-hosted/latest/local-preview`)
+	if !confirm() {
+		// send telemetry for user exit
+		fmt.Println("Exit")
+		send_telemetry("user exit")
+		return
+	}
+
 	dmp, err := os.OpenFile("logs.txt", os.O_WRONLY|os.O_TRUNC|os.O_CREATE, 0644)
 	if err != nil {
 		panic(err)