use the public OSS-Fuzz corpus on CFLite

.clusterfuzzlite/Dockerfile

@@ -1,6 +1,6 @@
 FROM gcr.io/oss-fuzz-base/base-builder:v1
 RUN apt-get update && \
-    apt-get install -y pkg-config make autoconf autopoint zlib1g-dev flex bison gawk
+    apt-get install -y pkg-config make autoconf autopoint zlib1g-dev flex bison gawk wget
 COPY .clusterfuzzlite/build.sh $SRC
 COPY . $SRC/elfutils
 WORKDIR $SRC/elfutils

tests/build-fuzzers.sh

@@ -103,4 +103,9 @@ $CC $CFLAGS \
 $CXX $CXXFLAGS $LIB_FUZZING_ENGINE fuzz-dwfl-core.o \
 	./libdw/libdw.a ./libelf/libelf.a -l:libz.a \
 	-o "$OUT/fuzz-dwfl-core"
-zip -r -j "$OUT/fuzz-dwfl-core_seed_corpus.zip" tests/fuzz-dwfl-core-crashes
+
+public_corpus=$(mktemp)
+wget -O "$public_corpus" https://storage.googleapis.com/elfutils-backup.clusterfuzz-external.appspot.com/corpus/libFuzzer/elfutils_fuzz-dwfl-core/public.zip
+unzip -qd tests/fuzz-dwfl-core-crashes "$public_corpus"
+rm -f "$public_corpus"
+zip -qr "$OUT/fuzz-dwfl-core_seed_corpus.zip" tests/fuzz-dwfl-core-crashes