fuzz: Use build script from upstream

Signed-off-by: Paulo Gomes <paulo.gomes@weave.works>

tests/fuzz/Dockerfile.builder

@@ -1,6 +1,9 @@
 FROM gcr.io/oss-fuzz-base/base-builder-go
 
-COPY ./ $GOPATH/src/github.com/fluxcd/pkg/
-COPY ./tests/fuzz/oss_fuzz_build.sh $SRC/build.sh
+ENV SRC=$GOPATH/src/github.com/fluxcd/pkg
+ENV FLUX_CI=true
+
+COPY ./ $SRC
+RUN wget https://raw.githubusercontent.com/google/oss-fuzz/master/projects/fluxcd/build.sh -O $SRC/build.sh
 
 WORKDIR $SRC

tests/fuzz/oss_fuzz_run.sh

@@ -17,4 +17,4 @@
 set -euxo pipefail
 
 # run each fuzzer once to ensure they are working properly
-find /out -type f -name "fuzz*" -exec echo {} -runs=1 \; | bash -e
+find /out -type f -iname "fuzz*" -exec echo {} -runs=1 \; | bash -e