feat: add Docker, Drone CI, and k8s deployment manifests

- Dockerfile for Python 3.12 FastAPI app
- Drone CI pipeline to build and push to internal registry
- Kubernetes manifests (Deployment, Service, Secret, Namespace)
- ArgoCD Application for GitOps deployment
- Kustomize base configuration

k8s/argocd-app.yaml

@@ -0,0 +1,20 @@
+apiVersion: argoproj.io/v1alpha1
+kind: Application
+metadata:
+  name: invest-api
+  namespace: argocd
+spec:
+  project: default
+  source:
+    repoURL: https://git.colacoder.com/kai/openbb-invest-api.git
+    targetRevision: main
+    path: k8s/base
+  destination:
+    server: https://kubernetes.default.svc
+    namespace: invest-api
+  syncPolicy:
+    automated:
+      prune: true
+      selfHeal: true
+    syncOptions:
+      - CreateNamespace=true