add cvaas evpn aa demo

.devcontainer/cvaas-cvaas-and-avd-demo--evpn-aa/devcontainer.json

@@ -0,0 +1,27 @@
+{
+    "image": "ghcr.io/arista-netdevops-community/one-click-se-demos/cvaas:cvaas-and-avd-demo--evpn-aa",
+    // containerEnv set the variables applied to entire container
+    "containerEnv": {
+        "ARISTA_TOKEN": "${localEnv:ARTOKEN}",
+        "CV_API_TOKEN": "${localEnv:CV_API_TOKEN}",
+        "CONTAINERWSF": "${containerWorkspaceFolder}"
+    },
+    "secrets": {
+        "CV_API_TOKEN": {
+          "description": "CVaaS service account token."
+          // "documentationUrl": "https://example.com/link/to/info"
+        },
+        "ARTOKEN": {
+          "description": "token to auto-download EOS images from arista.com."
+          // "documentationUrl": "https://example.com/link/to/info"
+        }
+    },
+    "hostRequirements": {
+      "cpus": 4,
+      "memory": "16gb",
+      "storage": "32gb"
+    },
+    "postCreateCommand": "postCreate.sh",
+    "workspaceMount": "source=${localWorkspaceFolder}/demos/${containerWorkspaceFolder},target=/${containerWorkspaceFolder},type=bind",
+    "workspaceFolder": "/cvaas-cvaas-and-avd-demo--evpn-aa"
+}

.github/workflows/cvaas-cvaas-and-avd-demo--evpn-aa.yml

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+---
+name: build container for CVaaS and AVD Demo, EVPN AA
+
+on:
+  push:
+    branches: [main]
+    paths:
+      - .github/workflows/cvaas-cvaas-and-avd-demo--evpn-aa.yml
+      - .github/workflows/container-build-child-workflow.yml
+      - containers/cvaas-cvaas-and-avd-demo--evpn-aa/**
+  workflow_dispatch:
+    branches: [main]
+
+jobs:
+  build-demo-container:
+    uses: ./.github/workflows/container-build-child-workflow.yml
+    with:
+      container_name: "cvaas"
+      image_tags: "cvaas-and-avd-demo--evpn-aa"
+      from_image: "ghcr.io/aristanetworks/avd/universal"
+      from_variant: "python3.11-avd-v4.7.1"
+      username: "avd"
+      clab_version: "0.54.2"
+      ceos_lab_version: "4.30.6M"
+      git_init: True