FEAT(ci): add ArgoCD Image Updater and CI/CD pipelines

- ArgoCD Image Updater for Zot registry polling
- Tekton Tasks: git-clone, buildah-build-push
- Pipelines: nextjs, fastapi, python
- ExternalSecrets for Zot and GitHub credentials

tekton/ci-cd/argocd.yaml

@@ -0,0 +1,28 @@
+apiVersion: argoproj.io/v1alpha1
+kind: Application
+metadata:
+  name: tekton-ci-cd
+  namespace: argocd
+  annotations:
+    argocd.argoproj.io/compare-options: IgnoreExtraneous
+spec:
+  project: default
+  source:
+    repoURL: https://github.com/K3S-HOME/platform.git
+    targetRevision: main
+    path: tekton/ci-cd/manifests
+  destination:
+    server: https://kubernetes.default.svc
+    namespace: tekton-pipelines
+  syncPolicy:
+    automated:
+      prune: false
+      selfHeal: true
+    syncOptions:
+      - CreateNamespace=true
+    retry:
+      limit: 5
+      backoff:
+        duration: 5s
+        factor: 2
+        maxDuration: 3m