Add clusterfuzzlite to fuzz in CI

.clusterfuzzlite/Dockerfile

@@ -0,0 +1,7 @@
+FROM gcr.io/oss-fuzz-base/base-builder:v1
+COPY . $SRC/PX4-Autopilot
+RUN apt-get install -y libjpeg8-dev zlib1g-dev
+RUN pip3 install --upgrade pip
+RUN python3 -m pip install -r $SRC/PX4-Autopilot/Tools/setup/requirements.txt
+WORKDIR $SRC/PX4-Autopilot
+COPY ./.clusterfuzzlite/build.sh $SRC/

.clusterfuzzlite/build.sh

@@ -0,0 +1,4 @@
+#!/usr/bin/env bash -eu
+
+PX4_FUZZ=1 make px4_sitl
+cp build/px4_sitl_default/bin/px4 $OUT/px4

.clusterfuzzlite/project.yaml

@@ -0,0 +1 @@
+language: c++