feat: добавить Image Gateway с кешем Souin

- добавлена сборка Caddy с Souin, Otter и NutsDB

- добавлена конфигурация dev, prod и test Docker Compose

- настроено кеширование через Otter L1 и NutsDB L2

- добавлены e2e-тесты Bun для кеша, restart и purge

- добавлена документация по запуску, API кеша и тестам

Dockerfile.caddy

@@ -0,0 +1,15 @@
+FROM caddy:2-builder AS builder
+
+RUN xcaddy build \
+    --with github.com/darkweak/souin/plugins/caddy \
+    --with github.com/darkweak/storages/otter/caddy \
+    --with github.com/darkweak/storages/nuts/caddy
+
+FROM caddy:2
+
+COPY --from=builder /usr/bin/caddy /usr/bin/caddy
+COPY entrypoint.caddy.sh /entrypoint.sh
+RUN chmod +x /entrypoint.sh
+
+ENTRYPOINT ["/entrypoint.sh"]
+CMD ["caddy", "run", "--config", "/etc/caddy/Caddyfile", "--adapter", "caddyfile"]