add method to get channel from user agent

backend/src/utils/posthog.ts

@@ -0,0 +1,15 @@
+const CLI_USER_AGENT_NAME = "cli"
+const K8_OPERATOR_AGENT_NAME = "k8-operator"
+export const getChannelFromUserAgent = function (userAgent: string | undefined) {
+  if (userAgent == undefined) {
+    return "other"
+  } else if (userAgent == CLI_USER_AGENT_NAME) {
+    return "cli"
+  } else if (userAgent == K8_OPERATOR_AGENT_NAME) {
+    return "k8-operator"
+  } else if (userAgent.toLowerCase().includes('mozilla')) {
+    return "web"
+  } else {
+    return "other"
+  }
+}