Add bicep files for Azure OpenAI resource provisioning

Backend/bicep/abbreviations.json

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+{
+    "keyVaultVaults": "kv-",
+    "resourcesResourceGroups": "rg-"
+}

Backend/bicep/ai.bicep

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+param name string
+param location string
+param deployments array = [
+  {
+    name: 'chat'
+    model: {
+      format: 'OpenAI'
+      name: 'gpt-4'
+      version: '0613'
+    }
+    sku: {
+      capacity: 1000
+    }
+  }
+]
+
+@description('')
+resource azureOpenAiResource 'Microsoft.CognitiveServices/accounts@2023-10-01-preview' = {
+  name: name
+  location: location
+  sku: {
+    name: 'S0'
+  }
+  kind: 'OpenAI'
+  tags: {}
+  properties: {
+    // customSubDomainName: needed?
+    networkAcls: {
+      defaultAction: 'Allow'
+      virtualNetworkRules: []
+      ipRules: []
+    }
+    publicNetworkAccess: 'Enabled'
+  }
+}
+
+resource modelDeployments 'Microsoft.CognitiveServices/accounts/deployments@2023-05-01' = [for item in deployments: {
+  parent: azureOpenAiResource
+  name: item.name
+  sku: (contains(item, 'sku') ? item.sku : {
+    name: 'Standard'
+    capacity: item.capacity
+  })
+  properties: {
+    model: item.model
+    raiPolicyName: (contains(item, 'raiPolicyName') ? item.raiPolicyName : null)
+  }
+}]
+
+output endpoint string = azureOpenAiResource.properties.endpoint

Backend/bicep/main.bicep

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+targetScope='subscription'
+
+// The main bicep module to provision Azure resources.
+// For a more complete walkthrough to understand how this file works with azd,
+// see https://learn.microsoft.com/azure/developer/azure-developer-cli/make-azd-compatible?pivots=azd-create
+
+var abbrs = loadJsonContent('./abbreviations.json')
+
+// Optional parameters to override the default azd resource naming conventions.
+// Add the following to main.parameters.json to provide values:
+// "resourceGroupName": {
+//      "value": "myGroupName"
+// }
+param resourceGroupName string = ''
+param azureOpenAIServiceName string = ''
+
+@minLength(1)
+@maxLength(64)
+@description('Name of the environment which is used to generate a short, unique hash used in all resources.')
+// For an overview on this and other key Azure concepts,
+// see https://learn.microsoft.com/azure/deployment-environments/concept-environments-key-concepts#environments
+param environmentName string
+
+// tags that will be applied to all resources.
+var tags = {
+  // Tag all resources with the environment name.
+  'azd-env-name': environmentName
+}
+
+@description('Location of all resources')
+param location string
+
+// Generate a unique token to be used in naming resources.
+// Remove linter suppression after using.
+#disable-next-line no-unused-vars
+var resourceToken = toLower(uniqueString(subscription().id, environmentName, location))
+
+// Resources are organized in a resource group
+resource rg 'Microsoft.Resources/resourceGroups@2022-09-01' = {
+  name: !empty(resourceGroupName) ? resourceGroupName : '${abbrs.resourcesResourceGroups}${environmentName}'
+  location: location
+  tags: tags
+}
+
+module azureOpenAi 'ai.bicep' = {
+  name: 'azureOpenAi'
+  params: {
+    name: !empty(azureOpenAIServiceName) ? azureOpenAIServiceName : 'aoai-${resourceToken}'
+    location: location
+  }
+  scope: rg
+}
+
+output AZURE_OPENAI_ENDPOINT string = azureOpenAi.outputs.endpoint

Backend/bicep/main.parameters.json

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+{
+    "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentParameters.json#",
+    "contentVersion": "1.0.0.0",
+    "parameters": {
+        "environmentName": {
+          "value": "${AZURE_ENV_NAME}"
+        },
+        "location": {
+          "value": "${AZURE_LOCATION}"
+        },
+        "resourceGroupName": {
+          "value": "${AZURE_RESOURCE_GROUP}"
+        },
+        "openAiServiceName": {
+          "value": "${AZURE_OPENAI_SERVICE}"
+        }
+    }
+}