[New] Add react environment variable for docker

Dockerfile

@@ -1,8 +1,12 @@
 # BASE STAGE
 # Prepare node, copy package.json
 FROM node:16-alpine AS base
+
+ARG REACT_APP_ENDPOINT
+
 WORKDIR /usr/src/app
 COPY package.json package-lock.json ./
+COPY create-env-file.sh ./create-env-file.sh
 
 # DEPENDENCIES STAGE
 # Install production and dev dependencies
@@ -11,6 +15,8 @@ FROM base AS dependencies
 #RUN npm set progress=false && npm config set depth 0
 RUN npm install
 
+RUN sh create-env-file.sh REACT_APP_ENDPOINT=$REACT_APP_ENDPOINT
+
 # BUILD STAGE
 # run NPM build
 FROM dependencies as build

create-env-file.sh

@@ -0,0 +1,6 @@
+touch .env
+
+for envvar in "$@"
+do
+   echo "$envvar" >> .env
+done

docker-compose.yml

@@ -0,0 +1,8 @@
+version: "3"
+services:
+  plan-manager:
+    container_name: plan-manager
+    build:
+      context: .
+      args:
+        - REACT_APP_ENDPOINT=https://kbss.felk.cvut.cz/csat/plan-manager/