small bug fix around duplicate out put

Author: joelsteventurner

Modules/Intent.Modules.AzureFunctions/Intent.AzureFunctions.imodspec

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <package>
   <id>Intent.AzureFunctions</id>
-  <version>5.0.20</version>
+  <version>5.0.21-pre.0</version>
   <supportedClientVersions>[4.5.15-a, 5.0.0-a)</supportedClientVersions>
   <summary>Provides support to describe Azure Functions in the Services designer</summary>
   <description>Provides support to describe Azure Functions in the Services designer</description>

Modules/Intent.Modules.AzureFunctions/Templates/Isolated/Program/ProgramTemplatePartial.cs

@@ -227,7 +227,11 @@ public IProgramFile ConfigureAppConfiguration(
                 parameters: parameters,
                 configure: (block, @params) =>
                 {
-                    block.AddStatement("config.AddEnvironmentVariables();");
+                    var existing = block.FindStatement(s => s.GetText("").StartsWith("config.AddEnvironmentVariables"));
+                    if (existing is null)
+                    {
+                        block.AddStatement("config.AddEnvironmentVariables();");
+                    }
                     configure?.Invoke(block, @params);
                 },
                 priority: priority);