Add system dependencies required by RapidOCR to fix Khoj Docker image (#842)

- Issue
The Khoj docker build would fail with `ImportError: libGL.so.1: cannot open shared object file: No such file or directory`. This was required by the Khoj RapidOCR python package dependency. 

- Fix
A minimal set of system packages have been added to resolve this issue.

Dockerfile

@@ -12,6 +12,9 @@ RUN curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | apt-key add -
 RUN echo "deb https://dl.yarnpkg.com/debian/ stable main" | tee /etc/apt/sources.list.d/yarn.list
 RUN apt update && apt -y install yarn
 
+# Install RapidOCR dependencies
+RUN apt -y install libgl1 libgl1-mesa-glx libglib2.0-0
+
 # Install Application
 WORKDIR /app
 COPY pyproject.toml .