Update chart testing config

Author: matthewelwell

.github/workflows/release.yaml

@@ -27,6 +27,7 @@ jobs:
           helm repo add stable https://charts.helm.sh/stable
           helm repo add influxdb2 https://helm.influxdata.com/
           helm repo add bitnami https://charts.bitnami.com/bitnami
+          helm repo add graphite file://../graphite
 
       - name: Set up chart-testing
         uses: helm/chart-testing-action@v2.0.1

ct.yaml

@@ -4,6 +4,7 @@ chart-repos:
   - stable=https://charts.helm.sh/stable
   - bitnami=https://charts.bitnami.com/bitnami
   - influxdata=https://helm.influxdata.com/
+  - graphite=file://../graphite
 target-branch: main
 validate-maintainers: false
 helm-extra-args: '--timeout 30m'