Trying to create dockerfile for selenium-node-firefox - node.js

Question

I'm trying to create a dockerfile for my Node application that uses Selenium WebDriver. I tried the code below, it creates a directory for node, install geckodriver and firefox.
FROM node:12
WORKDIR /usr/app
COPY package*.json ./
RUN npm install
# Install geckodriver
RUN wget https://github.com/mozilla/geckodriver/releases/download/v0.24.0/geckodriver-v0.24.0-linux64.tar.gz
RUN tar -xvzf geckodriver-v0.24.0-linux64.tar.gz
RUN chmod +x geckodriver
RUN mv geckodriver /usr/local/bin/
# Install firefox
RUN wget "https://download.mozilla.org/?product=firefox-latest&os=linux&lang=pt-BR" -O firefox.tar.bz2
RUN tar -jxvf firefox.tar.bz2 -C /usr/local/bin/
COPY . .
EXPOSE 3000
CMD ["npm", "start"]
The error I receive is SessionNotCreatedError: Expected browser binary location, but unable to find binary in default location, no 'moz:firefoxOptions.binary' capability provided, and no binary flag set on the command line. So, the geckodriver doesn't find the firefox binary. I guess isn't setting the firefox well in PATH system, I try to call firefox --version and not found.
The index.js only do:
const { Builder } = require('selenium-webdriver');
const driver = await new Builder().forBrowser('firefox').build();
await driver.get('https://google.com');

Answer 1

I solve the problem with this dockerfile:
FROM ubuntu
RUN apt-get update
RUN apt install nodejs -y
RUN apt install npm -y
RUN node -v
WORKDIR /usr/app
COPY package*.json ./
RUN npm install
RUN apt install wget -y
RUN wget https://github.com/mozilla/geckodriver/releases/download/v0.29.0/geckodriver-v0.29.0-linux64.tar.gz
RUN tar -xvzf geckodriver-v0.29.0-linux64.tar.gz
RUN chmod +x geckodriver
RUN mv geckodriver /usr/local/bin/
RUN apt install firefox -y
RUN export MOZ_HEADLESS=1
COPY . .
EXPOSE 3000
CMD ["npm", "start"]
I've changed the firefox installation way and added export MOZ_HEADLESS=1