add azure-dev-validation (#192)

## Purpose
<!-- Describe the intention of the changes being proposed. What problem
does it solve or functionality does it add? -->
* ...

fix
#189 
## Does this introduce a breaking change?
<!-- Mark one with an "x". -->
```
[ ] Yes
[ ] No
```

## Pull Request Type
What kind of change does this Pull Request introduce?

<!-- Please check the one that applies to this PR using "x". -->
```
[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Documentation content changes
[ ] Other... Please describe:
```

## How to Test
*  Get the code

```
git clone [repo-address]
cd [repo-name]
git checkout [branch-name]
npm install
```

* Test the code
<!-- Add steps to run the tests suite and/or manually test -->
```
```

## What to Check
Verify that the following are valid
* ...

## Other Information
<!-- Add any other helpful information that may be needed here. -->

Author: LittleLittleCloud

.github/workflows/azure-dev-validation.yml

@@ -0,0 +1,37 @@
+name: Validate AZD template
+on:
+  workflow_dispatch:
+  push:
+    branches: [ main ]
+    paths:
+      - "infra/**"
+  pull_request:
+    branches: [ main ]
+    paths:
+      - "infra/**"
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Build Bicep for linting
+        uses: azure/CLI@v1
+        with:
+          inlineScript: az config set bicep.use_binary_from_path=false && az bicep build -f infra/main.bicep --stdout
+          
+      - name: Run Microsoft Security DevOps Analysis
+        uses: microsoft/security-devops-action@preview
+        id: msdo
+        continue-on-error: true
+        with:
+          tools: templateanalyzer
+
+      - name: Upload alerts to Security tab
+        uses: github/codeql-action/upload-sarif@v2
+        if: github.repository == 'Azure-Samples/azure-search-openai-demo-csharp'
+        with:
+          sarif_file: ${{ steps.msdo.outputs.sarifFile }}