fix: add --load flag to docker buildx build

Author: philasmar

.autover/changes/aeb80c58-0a88-4bcb-9fc4-c23c4045e6ec.json

@@ -0,0 +1,11 @@
+{
+  "Projects": [
+    {
+      "Name": "AWS.Deploy.CLI",
+      "Type": "Patch",
+      "ChangelogMessages": [
+        "Add the --load flag in docker buildx build because, unlike the standard docker build command, buildx doesn't automatically load the resulting image into the local Docker image store. When using buildx with certain docker drivers (like docker-container), the build process happens in a container, and the resulting image needs to be explicitly loaded into the local image store using --load."
+      ]
+    }
+  ]
+}

src/AWS.Deploy.Orchestration/DeploymentBundleHandler.cs

@@ -66,7 +66,7 @@ public async Task BuildContainerImage(CloudApplication cloudApplication, Recomme
             if (currentArchitecture != recommendation.DeploymentBundle.EnvironmentArchitecture)
             {
                 var platform = recommendation.DeploymentBundle.EnvironmentArchitecture == SupportedArchitecture.Arm64 ? "linux/arm64" : "linux/amd64";
-                buildCommand = $"{commandName} buildx build --platform {platform} -t {imageTag} -f \"{dockerFile}\"{buildArgs} .";
+                buildCommand = $"{commandName} buildx build --load --platform {platform} -t {imageTag} -f \"{dockerFile}\"{buildArgs} .";
             }
 
             interactiveService.LogInfoMessage($"Container Execution Directory: {Path.GetFullPath(containerExecutionDirectory)}");