Optimization: process dirs checks before running the image

[NandyBa]

Description:

The current Dockerfile installs numerous dependencies prior to validating the input directories. This could potentially lead to unnecessary resource usage and time consumption, especially if the input directories are invalid.

wget -q -O - https://dl-ssl.google.com/linux/linux_signing_key.pub | apt-key add - && \
    sh -c 'echo "deb [arch=amd64] http://dl.google.com/linux/chrome/deb/ stable main" >> /etc/apt/sources.list.d/google.list' && \
    apt-get update && \
    apt-get -y install xvfb gconf-service libasound2 libatk1.0-0 libc6 libcairo2 libcups2 \
    libdbus-1-3 libexpat1 libfontconfig1 libgcc1 libgconf-2-4 libgdk-pixbuf2.0-0 libglib2.0-0 \
    libgtk-3-0 libnspr4 libpango-1.0-0 libpangocairo-1.0-0 libstdc++6 libx11-6 libx11-xcb1 libxcb1 \
    libxcomposite1 libxcursor1 libxdamage1 libxext6 libxfixes3 libxi6 libxrandr2 libxrender1 libxss1 \
    libxtst6 ca-certificates fonts-liberation libnss3 lsb-release xdg-utils wget curl google-chrome-stable \
    fonts-ipafont-gothic fonts-wqy-zenhei fonts-thai-tlwg fonts-kacst fonts-freefont-ttf && \
    rm -rf /var/lib/apt/lists/*

To optimize this process, it is proposed to validate the input directories and other checks before installing the dependencies. This way, if there are any issues with the directories, the error can be returned promptly, avoiding the unnecessary installation of dependencies. This change will make the Dockerfile more efficient and responsive.