fix(service): posthog template

[n0]

Changes

Rewrote PostHog template. It has been disabled since September 2025 #6677 (⁶🤷‍♂️⁷ just had to) because of broken ClickHouse configs and missing env vars.

What changed:

• ClickHouse configs are now inline via content: mounts instead of downloading from GitHub at runtime
• Added the missing hobby deployment services (temporal, livestream, feature-flags, capture, replay-capture, cymbal, etc)
• Added a geoip-init container that downloads the MaxMind DB from PostHog so cymbal/feature-flags don't crash
• Caddy config routes capture/replay/livestream/flags to the right backend services
• Fixed missing env vars (TEMPORAL_HOST, CLICKHOUSE_API/APP users, etc)

Issues

• fixes: [Bug]: Posthog Template not working  #3597

Category

• Fixing or updating existing one click service

AI Usage

• AI is NOT used in the process of creating this PR

Steps to Test

• Step 1 - create a new service, paste the yaml from templates/compose/posthog.yaml
• Step 2 - deploy, wait a few minutes for initial migrations to finish
• Step 3 - hit the service url, should redirect to /preflight setup page

Contributor Agreement

Important

• I have read and understood the contributor guidelines. If I have failed to follow any guideline, I understand that this PR may be closed without review.
• I have tested the changes thoroughly and am confident that they will work as expected without issues when the maintainer tests them