Add opt-out backend telemetry and fix dev compose frontend envars

backend/src/services/PostHogClient.ts

@@ -0,0 +1,15 @@
+import { PostHog } from 'posthog-node';
+import { NODE_ENV, POSTHOG_HOST, POSTHOG_PROJECT_API_KEY, TELEMETRY_ENABLED } from '../config';
+
+let postHogClient: any;
+if (
+    NODE_ENV === 'production'
+    && TELEMETRY_ENABLED
+) {
+    // case: enable opt-out telemetry in production
+    postHogClient = new PostHog(POSTHOG_PROJECT_API_KEY, {
+        host: POSTHOG_HOST
+    });
+}
+
+export default postHogClient;

backend/src/services/index.ts

@@ -0,0 +1,5 @@
+import postHogClient from './PostHogClient';
+
+export {
+    postHogClient
+}