test: add nginx config smoke test based on the config in the docs

Signed-off-by: Xe Iaso <me@xeiaso.net>

test/nginx/test.sh

@@ -0,0 +1,24 @@
+#!/usr/bin/env bash
+
+export VERSION=$GITHUB_COMMIT-test
+export KO_DOCKER_REPO=ko.local
+
+source ../lib/lib.sh
+
+set -euo pipefail
+
+build_anubis_ko
+mint_cert mimi.techaro.lol
+
+docker run --rm -it \
+	-v ./conf/nginx:/etc/nginx:ro \
+	-v ../pki:/techaro/pki:ro \
+	nginx \
+	nginx -t
+
+docker compose up -d
+
+docker compose down -t 1 || :
+docker compose rm -f || :
+
+exit 0