configs/paivana: charge GOA:4200 for example site

2026/2026-07-13--paivana-goa.md

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+# 2026-07-13 — Paivana (GOA paywall) on koopa
+
+## Done
+
+- Podman stack **`koopa-paivana`** + **`koopa-paivana-upstream`** at `~/koopa-paivana/`
+- Host port **9025**
+- Image `localhost/koopa-paivana:latest` (built from `git.taler.net/paivana` + deb.taler.net libs; package not on apt yet)
+- Merchant: instance **`goa-shop`**, template **`paivana`** (`template_type: paivana`, **GOA:4200**)
+- After payment: site-wide cookie (`-g`) → example upstream free to browse
+- `extra_hosts: taler.hacktivism.ch:host-gateway` so pasta can reach merchant
+- Flags: `-g` (site-wide), `-f` (X-Forwarded-For)
+- Smoke: `curl -si http://127.0.0.1:9025/` → **302** to `/.well-known/paivana/templates/paivana#…`
+- Config mirror: `configs/paivana/`
+- Caddy: `paivana.hacktivism.ch` → `:9025` (`configs/caddy/Caddyfile`)
+- User unit: `container-koopa-paivana.service` enabled
+
+## Refs
+
+- https://docs.taler.net/taler-paivana-manual.html
+- https://docs.taler.net/design-documents/095-captcha-100.html