add store dir

Dockerfile

@@ -1,4 +1,4 @@
-FROM node:14-alpine AS builder
+FROM node:14-alpine
 MAINTAINER Thomas Ruoff <thomasruoff@gmail.com>
 
 RUN apk add --no-cache texlive texmf-dist
@@ -10,6 +10,9 @@ COPY --chown=1000:1000 . /home/node
 WORKDIR /home/node
 RUN npm ci && npm run build
 
+ENV JSON_STORE=/pdfer-store
+VOLUME /pdfer-store
+
 EXPOSE 3000
 
 CMD npm run start