fix(Dockerfile): update Node.js version to 18-slim and adjust npm install for better dependency handling

Author: valearna

src/frontend/submission_form/Dockerfile

@@ -1,9 +1,10 @@
-FROM node:8.2.1 as build-stage
+FROM node:18-slim as build-stage
 RUN mkdir /usr/src/app
 WORKDIR /usr/src/app
 ENV PATH /usr/src/app/node_modules/.bin:$PATH
 COPY src/frontend/submission_form .
-RUN npm install --silent
+RUN npm cache clean --force
+RUN npm install --legacy-peer-deps --silent
 RUN npm run build --production
 
 FROM nginx:1.15.2-alpine