feat: add github status notifications

Author: muhlba91

infrastructure/flux-extensions/alerts/kustomization.yaml

@@ -4,6 +4,7 @@ kind: Kustomization
 namespace: flux-system
 resources:
   - ./provider-slack.yaml
+  - ./provider-github.yaml
   - ./global.yaml
   - ./infrastructure.yaml
   - ./core.yaml

infrastructure/flux-extensions/kustomization.yaml

@@ -4,4 +4,5 @@ kind: Kustomization
 namespace: flux-system
 resources:
   - ./external-secret-slack.yaml
+  - ./external-secret-github.yaml
   - ./alerts/