add dependency map

src/Microsoft.Tye.Core/ConfigModel/ConfigService.cs

@@ -46,5 +46,7 @@ public class ConfigService
         public string? Version { get; set; }
         public string? Architecture { get; set; }
         public string? CloneDirectory { get; internal set; }
+
+        public List<string> DependsOn { get; set; } = new List<string>();
     }
 }

src/Microsoft.Tye.Core/Serialization/ConfigServiceParser.cs

@@ -164,6 +164,13 @@ private static void HandleServiceNameMapping(YamlMappingNode yamlMappingNode, Co
                     case "cloneDirectory":
                         service.CloneDirectory = YamlParser.GetScalarValue(key, child.Value);
                         break;
+                    case "dependsOn":
+                        if (child.Value.NodeType != YamlNodeType.Sequence)
+                        {
+                            throw new TyeYamlException(child.Value.Start, CoreStrings.FormatExpectedYamlSequence(key));
+                        }
+                        HandleDependencies((child.Value as YamlSequenceNode)!, service.DependsOn);
+                        break;
                     default:
                         throw new TyeYamlException(child.Key.Start, CoreStrings.FormatUnrecognizedKey(key));
                 }
@@ -578,6 +585,15 @@ private static void HandleServiceTags(YamlSequenceNode yamlSequenceNode, List<st
                 tags.Add(tag);
             }
         }
+
+        private static void HandleDependencies(YamlSequenceNode yamlSequenceNode, List<string> dependencies)
+        {
+            foreach (var child in yamlSequenceNode!.Children)
+            {
+                var dependsOn = YamlParser.GetScalarValue(child);
+                dependencies.Add(dependsOn);
+            }
+        }
 
         private static void HandleServiceBindingRoutes(YamlSequenceNode yamlSequenceNode, List<string> routes)
         {

test/E2ETest/testassets/projects/multirepo/vote/tye.yaml

@@ -2,6 +2,8 @@ name: VotingSample
 services:
 - name: vote
   project: vote.csproj
+  dependsOn:
+    - redis
 - name: worker
   include: ../worker/tye.yaml
 - name: redis