Fix chart testing for CI

Get CT base ref from prow rather than git remote

Signed-off-by: Connor Catlett <conncatl@amazon.com>

hack/prow.sh

@@ -43,3 +43,8 @@ export REGISTRY=$REGISTRY_NAME
 export TAG=$GIT_TAG
 export VERSION=$PULL_BASE_REF
 IMAGE=gcr.io/k8s-staging-provider-aws/aws-ebs-csi-driver make all-push
+
+# Setup required for chart tester becuase is ALWAYS needs a remote
+git remote add ct https://github.com/kubernetes-sigs/aws-ebs-csi-driver.git
+export CT_REMOTE=ct
+export CT_SINCE=$PULL_BASE_REF

tests/ct-config.yaml

@@ -1,7 +1,3 @@
-remote: origin
-since: HEAD~1
-github-instance: https://github.com
-lint-conf: tests/ct-lintconfig.yaml
 validate-chart-schema: false
 validate-yaml: false
 check-version-increment: false
@@ -15,4 +11,3 @@ release-label: release
 kubectl-timeout: 3000s
 skip-clean-up: false
 print-logs: true
-debug: false