fuzz: Ensure Go 1.18 for fuzz image

- Upgrade fuzz container to Go 1.18.
- Upgrade worker to Go 1.18.
- The mod replace in tests/fuzz was pointing to the wrong controller.

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

.github/workflows/cifuzz.yaml

@@ -17,6 +17,10 @@ jobs:
     steps:
     - name: Checkout
       uses: actions/checkout@v3
+    - name: Setup Go
+      uses: actions/setup-go@v3
+      with:
+        go-version: 1.18.x
     - name: Restore Go cache
       uses: actions/cache@v3
       with:

tests/fuzz/Dockerfile.builder

@@ -1,5 +1,10 @@
+FROM golang:1.18 AS go
+
 FROM gcr.io/oss-fuzz-base/base-builder-go
 
+# ensures golang 1.18 to enable go native fuzzing.
+COPY --from=go /usr/local/go /usr/local/
+
 COPY ./ $GOPATH/src/github.com/fluxcd/source-controller/
 COPY ./tests/fuzz/oss_fuzz_build.sh $SRC/build.sh
 

tests/fuzz/go.mod

@@ -2,6 +2,6 @@ module github.com/fluxcd/source-controller/tests/fuzz
 
 go 1.18
 
-replace github.com/fluxcd/kustomize-controller/api => ../../api
+replace github.com/fluxcd/source-controller/api => ../../api
 
-replace github.com/fluxcd/kustomize-controller => ../../
+replace github.com/fluxcd/source-controller => ../../