Replace cifuzz with custom smoke test

The official git actions goes through all fluxcd repos, which in
time will be extremely long and painful to run on each PR.
This smoke test will ensure the fuzzer correctness until a new
action is in place to run the process as advised by oss-fuzz.

Signed-off-by: Paulo Gomes <[email protected]>

.github/workflows/cifuzz.yaml

@@ -7,21 +7,14 @@ jobs:
   Fuzzing:
     runs-on: ubuntu-latest
     steps:
-    - name: Build Fuzzers
-      id: build
-      uses: google/oss-fuzz/infra/cifuzz/actions/build_fuzzers@master
+    - name: Checkout
+      uses: actions/checkout@v2
+    - name: Restore Go cache
+      uses: actions/cache@v1
       with:
-        oss-fuzz-project-name: 'fluxcd'
-        language: go
-    - name: Run Fuzzers
-      uses: google/oss-fuzz/infra/cifuzz/actions/run_fuzzers@master
-      with:
-        oss-fuzz-project-name: 'fluxcd'
-        language: go
-        fuzz-seconds: 60
-    - name: Upload Crash
-      uses: actions/upload-artifact@v1
-      if: failure() && steps.build.outcome == 'success'
-      with:
-        name: artifacts
-        path: ./out/artifacts
+        path: /home/runner/work/_temp/_github_home/go/pkg/mod
+        key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
+        restore-keys: |
+          ${{ runner.os }}-go-
+    - name: Smoke test Fuzzers
+      run: make fuzz-smoketest

Makefile

@@ -115,19 +115,18 @@ fuzz-build:
 	mkdir -p $(shell pwd)/build/fuzz/out/
 
 	docker build . --tag local-fuzzing:latest -f tests/fuzz/Dockerfile.builder
-	docker run --rm -it \
-		-e FUZZING_LANGUAGE=go -e FUZZ_SECONDS=600 -e MODE=batch \
+	docker run --rm \
+		-e FUZZING_LANGUAGE=go -e SANITIZER=address \
 		-e CIFUZZ_DEBUG='True' -e OSS_FUZZ_PROJECT_NAME=fluxcd \
-		-e SANITIZER=address \
 		-v "$(shell pwd)/build/fuzz/out":/out \
 		local-fuzzing:latest
 
 # Run each fuzzer once to ensure they are working
 fuzz-smoketest: fuzz-build
-	docker run --rm -ti \
+	docker run --rm \
 		-v "$(shell pwd)/build/fuzz/out":/out \
 		-v "$(shell pwd)/tests/fuzz/oss_fuzz_run.sh":/runner.sh \
-		gcr.io/oss-fuzz/fluxcd \
+		local-fuzzing:latest \
 		bash -c "/runner.sh"
 
 # Find or download controller-gen