Dockerfile: Increase vm.max_map_count

Fix the resource exhaustion problem on the build infrastructure.

Suggested-by: Stu Westerman @stu-spp
Signed-off-by: Leon Anavi <leon.anavi@konsulko.com>

.github/workflows/docker-images/yocto-builder/Dockerfile

@@ -30,6 +30,9 @@ RUN eatmydata apt-get clean && rm -rf /var/lib/apt/lists/*
 RUN echo "dash dash/sh boolean false" | debconf-set-selections \
  && dpkg-reconfigure dash
 
+# Fix the resource exhaustion problem on the build infrastructure
+RUN echo 'vm.max_map_count = 4048576' >> /etc/sysctl.conf
+
 # Run under normal user called 'ci'
 RUN useradd --create-home --uid 1000 --shell /usr/bin/bash ci
 USER ci