Runs nginx on port from environment variable

Dockerfile

@@ -17,8 +17,15 @@ RUN npm install && \
 FROM nginx
 COPY --from=builder /crc-bpmn/dist/* /usr/share/nginx/html/
 COPY --from=builder /crc-bpmn/nginx.conf /etc/nginx/conf.d/default.conf
+
+# Script for substituting environment variables
 COPY ./docker/substitute-env-variables.sh ./entrypoint.sh
 RUN chmod +x ./entrypoint.sh
+
+# Substitute environment variables in nginx configuration
+CMD ["./entrypoint.sh", "/etc/nginx/conf.d/default.conf"]
+
+# Substitute environment variables in index.html
 ENTRYPOINT ["./entrypoint.sh", "/usr/share/nginx/html/index.html"]
 
 ### STAGE 3: Profit! ###

docker/substitute-env-variables.sh

@@ -7,7 +7,7 @@ if [[ -z $1 ]]; then
 fi
 
 # Replace strings in the given file that have the format ${ENV_VAR}
-envsubst '\$PRODUCTION \$API_URL \$IRB_URL' < "$1" > "$1".tmp && mv "$1".tmp "$1"
+envsubst '\$PRODUCTION \$API_URL \$IRB_URL \$PORT0' < "$1" > "$1".tmp && mv "$1".tmp "$1"
 
 # Set DEBUG=true in order to log the replaced file
 if [ "$DEBUG" = true ] ; then

nginx.conf

@@ -1,5 +1,5 @@
 server {
-  listen 80;
+  listen $PORT0;
 
   location / {
     root /usr/share/nginx/html;