Fix Unix deployment of frontend (microsoft#194)

### Motivation and Context
I introduced a bug with
microsoft#165 in the frontend
deployment script

### Description
Use proper Unix commands in the shell script

### Contribution Checklist
- [ ] The code builds clean without any errors or warnings
- [ ] The PR follows the [Contribution
Guidelines](https://github.com/microsoft/copilot-chat/blob/main/CONTRIBUTING.md)
and the [pre-submission formatting
script](https://github.com/microsoft/copilot-chat/blob/main/CONTRIBUTING.md#development-scripts)
raises no violations
- [ ] All unit tests pass, and I have added new tests where possible
- [ ] I didn't break anyone 😄

.github/workflows/copilot-deploy-frontend.yml

@@ -82,12 +82,12 @@ jobs:
       - name: Set version tag
         id: versiontag
         run: |
-          $VERSION_TAG = "${{ steps.gitversion.outputs.Major }}."
-          $VERSION_TAG += "${{ steps.gitversion.outputs.Minor }}."
-          $VERSION_TAG += "${{ steps.gitversion.outputs.CommitsSinceVersionSource }}"
+          VERSION_TAG="${{ steps.gitversion.outputs.Major }}."
+          VERSION_TAG+="${{ steps.gitversion.outputs.Minor }}."
+          VERSION_TAG+="${{ steps.gitversion.outputs.CommitsSinceVersionSource }}"
           echo $VERSION_TAG
-          Write-Output "versiontag=$VERSION_TAG" >> $env:GITHUB_OUTPUT
+          echo "versiontag=$VERSION_TAG" >> "$GITHUB_OUTPUT"
 
       - name: Deploy SWA
         run: |
-          scripts/deploy/deploy-webapp.sh --subscription ${{secrets.AZURE_SUBSCRIPTION_ID}} --resource-group ${{vars.CC_DEPLOYMENT_GROUP_NAME}} --deployment-name ${{inputs.DEPLOYMENT_NAME}} --application-id ${{vars.APPLICATION_CLIENT_ID}} --authority ${{secrets.APPLICATION_AUTHORITY}} --no-redirect -version ${{ steps.versiontag.outputs.versiontag }} -version-info "Built from commit ${{ steps.gitversion.outputs.ShortSha }} on $(Get-Date -Format "yyyy-MM-dd")"
+          scripts/deploy/deploy-webapp.sh --subscription ${{secrets.AZURE_SUBSCRIPTION_ID}} --resource-group ${{vars.CC_DEPLOYMENT_GROUP_NAME}} --deployment-name ${{inputs.DEPLOYMENT_NAME}} --application-id ${{vars.APPLICATION_CLIENT_ID}} --authority ${{secrets.APPLICATION_AUTHORITY}} --no-redirect --version ${{ steps.versiontag.outputs.versiontag }} --version-info "Built from commit ${{ steps.gitversion.outputs.ShortSha }} on $(date +"%Y-%m-%d")"

scripts/deploy/deploy-webapp.sh

@@ -54,7 +54,7 @@ while [[ $# -gt 0 ]]; do
         shift
         shift
         ;;
-        -i|--version-nfo)
+        -i|--version-info)
         VERSION_INFO="$2"
         shift
         shift
@@ -177,4 +177,4 @@ if [ "$NO_REDIRECT" != true ]; then
     fi
 fi
 
-echo "To verify your deployment, go to 'https://$WEB_APP_URL' in your browser."
+echo "To verify your deployment, go to 'https://$WEB_APP_URL' in your browser."