Update Dockerfile to include apt-get update

Author: afrind

docker/Dockerfile

@@ -55,7 +55,7 @@ COPY . .
 
 # Run the build script using getdeps.py (already running as root)
 # First install system dependencies to reduce compilation
-RUN ./build/fbcode_builder/getdeps.py install-system-deps --recursive moxygen
+RUN apt-get update && ./build/fbcode_builder/getdeps.py install-system-deps --recursive moxygen                                                                           
 
 # Limit parallelism to 2 jobs to avoid OOM on GitHub Actions runners (7GB RAM)
 RUN ./build/fbcode_builder/getdeps.py build --allow-system-packages --num-jobs 2 --verbose moxygen 2>&1 || \