use prebuilt base image

docker/Dockerfile.ci

@@ -1,19 +1,2 @@
-FROM nginx:mainline-alpine
-
-COPY ./docker/default.conf /etc/nginx/conf.d/default.conf
-COPY ./docker/nginx.conf /etc/nginx/nginx.conf
-COPY ./docker/entrypoint.sh /
-
-RUN apk update --no-cache && apk upgrade --no-cache \
-    && apk add --no-cache openssl tzdata \
-    && mkdir -p /var/www/TeaWeb /etc/ssl/certs \
-    && chmod +x /entrypoint.sh
-
-ENV TZ="Europe/Berlin"
-
-EXPOSE 80 443
-
-ENTRYPOINT ["/entrypoint.sh"]
-CMD ["nginx", "-g", "daemon off;"]
-
+FROM reg.c1.datenclown.at/teaspeak/web-base:latest
 COPY ./dist/ /var/www/TeaWeb/