FEAT(tekton): add Tekton Triggers for GitHub webhooks

- Add EventListener for GitHub push events
- Add TriggerBinding for payload parsing
- Add TriggerTemplates for Next.js and FastAPI
- Add RBAC for trigger service account
- Add ExternalSecret for webhook secret from Vault
- Add Ingress at tekton0213.kro.kr/hooks

tekton/ci-cd/manifests/triggers/secret.yaml

@@ -0,0 +1,18 @@
+apiVersion: external-secrets.io/v1beta1
+kind: ExternalSecret
+metadata:
+  name: github-webhook-secret
+  namespace: tekton-pipelines
+spec:
+  refreshInterval: 1h
+  secretStoreRef:
+    name: vault-backend
+    kind: ClusterSecretStore
+  target:
+    name: github-webhook-secret
+    creationPolicy: Owner
+  data:
+    - secretKey: webhook-secret
+      remoteRef:
+        key: tekton
+        property: GITHUB_WEBHOOK_SECRET