feat(jenkins): manage portfolio version, caddy version and cache

Dockerfile

@@ -1,3 +1,5 @@
+ARG CADDY_VERSION
+
 # --- BUILD ---
 FROM node:24-alpine AS build
 RUN corepack enable && corepack prepare pnpm@latest --activate
@@ -15,7 +17,7 @@ COPY . .
 RUN pnpm build
 
 # --- DEPLOY ---
-FROM caddy:alpine
+FROM caddy:${CADDY_VERSION}-alpine
 COPY --from=build /app/dist /usr/share/caddy
 COPY Caddyfile /etc/caddy/Caddyfile