fix variable templates using expressions

src/Sdk/AzurePipelines/AzureDevops.cs

@@ -237,7 +237,8 @@ static async IAsyncEnumerable<TemplateToken> ProcessVariableSequence(Context con
                     }
                     else if (template != null)
                     {
-                        var file = await ReadTemplate(context, template, parameters != null ? parameters.AssertMapping("param").ToDictionary(kv => kv.Key.AssertString("").Value, kv => kv.Value) : null, "variable-template-root");
+                        var evalp = parameters != null ? TemplateEvaluator.Evaluate(staticVarCtx, "workflow-value", parameters, 0, parameters.FileId) : null;
+                        var file = await ReadTemplate(context, template, evalp != null ? evalp.AssertMapping("param").ToDictionary(kv => kv.Key.AssertString("").Value, kv => kv.Value) : null, "variable-template-root");
                         var res = await ParseVariables(context.ChildContext(file, template), vars, (from e in file where e.Key.AssertString("").Value == "variables" select e.Value).First(), staticVarCtx);
                         if (res is SequenceToken sq) {
                             await foreach(var x in ProcessVariableSequence(context, vars, staticVarCtx, staticVars, sq)) {

testworkflows/azpipelines/static-template-vars-dynamic-parameters/pipeline.yml

@@ -0,0 +1,13 @@
+parameters:
+- name: templateParameters
+  default: Release
+variables:
+  - template: vars.yml
+    parameters:
+      prefix: ${{ parameters.templateParameters }}
+  - name: ncfg
+    value: TEST-${{ variables.buildConfig }}
+steps:
+- bash: ${{ variables.ncfg }}
+- ${{ if ne(variables.ncfg, 'TEST-Release') }}:
+  -  assert: this won't work

testworkflows/azpipelines/static-template-vars-dynamic-parameters/vars.yml

@@ -0,0 +1,6 @@
+parameters:
+- name: prefix
+  default: Debug
+variables:
+- name: buildConfig
+  value: ${{ parameters.prefix }}

testworkflows/azpipelines/static-template-vars-dynamic-reference/pipeline.yml

@@ -0,0 +1,11 @@
+parameters:
+- name: templateName
+  default: ./vars.yml
+variables:
+  - template: ${{ parameters.templateName }}
+  - name: ncfg
+    value: TEST-${{ variables.buildConfig }}
+steps:
+- bash: ${{ variables.ncfg }}
+- ${{ if ne(variables.ncfg, 'TEST-Release') }}:
+  -  assert: this won't work

testworkflows/azpipelines/static-template-vars-dynamic-reference/vars.yml

@@ -0,0 +1,3 @@
+variables:
+- name: buildConfig
+  value: Release

testworkflows/azpipelines/static-template-vars-fully-dynamic/pipeline.yml

@@ -0,0 +1,15 @@
+parameters:
+- name: template
+  type: object
+  default:
+    template: vars.yml
+    parameters:
+      prefix: Release
+variables:
+  - ${{ parameters.template }}
+  - name: ncfg
+    value: TEST-${{ variables.buildConfig }}
+steps:
+- bash: ${{ variables.ncfg }}
+- ${{ if ne(variables.ncfg, 'TEST-Release') }}:
+  -  assert: this won't work

testworkflows/azpipelines/static-template-vars-fully-dynamic/vars.yml

@@ -0,0 +1,6 @@
+parameters:
+- name: prefix
+  default: Debug
+variables:
+- name: buildConfig
+  value: ${{ parameters.prefix }}