Move npm install to lower layer

Author: james-toussaint

docker/Dockerfile

@@ -1,9 +1,9 @@
 FROM node:22
 WORKDIR /iexec-poco-subgraph
 COPY package*.json .
+RUN npm ci
 COPY schema.graphql .
 COPY subgraph.template.yaml .
 COPY networks.json .
 COPY src src
-RUN npm ci
 ENTRYPOINT [ "npm", "run", "deploy:all" ]