[local-preview] honour DO_NOT_TRACK env variable

Currently, There is no way to disable telemetry for `local-preview`
as we run the cronjob manaully during init, when Gitpod is ready.

This fixes that by honouring [`DO_NOT_TRACK` envrionment variable](https://consoledonottrack.com/)
, which when set prevent the script from triggering the cronjob manually.

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

install/preview/entrypoint.sh

@@ -143,8 +143,15 @@ run_telemetry(){
   sleep 100
   # indefinitely wait for Gitpod pods to be ready
   kubectl wait --timeout=-1s --for=condition=ready pod -l app=gitpod,component!=migrations
-  # manually tun the cronjob
-  kubectl create job gitpod-telemetry-init --from=cronjob/gitpod-telemetry
+  echo "Gitpod pods are ready"
+  # honour DO_NOT_TRACK if set
+  if [ ! "${DO_NOT_TRACK:-0}" -eq 0 ] || [ -n "$DO_NOT_TRACK" ]; then
+    # suspend the cronjob
+    kubectl patch cronjobs gitpod-telemetry -p '{"spec" : {"suspend" : true }}'
+  else
+    # manually run the cronjob
+    kubectl create job gitpod-telemetry-init --from=cronjob/gitpod-telemetry
+  fi
 }
 
 run_telemetry 2>&1 &

install/preview/prettylog/main.go

@@ -24,7 +24,7 @@ var msgs = []struct {
 	{Msg: "preparing system", Success: "extracting images to download ahead"},
 	{Msg: "downloading images", Success: "--output-split-files"},
 	{Msg: "preparing Gitpod preview installation", Success: "rm -rf /var/lib/rancher/k3s/server/manifests/gitpod"},
-	{Msg: "starting Gitpod", Success: "gitpod-telemetry-init"},
+	{Msg: "starting Gitpod", Success: "Gitpod pods are ready"},
 	{Msg: fmt.Sprintf("Gitpod is running. Visit https://%s to access the dashboard", os.Getenv("DOMAIN"))},
 }