chore(docs): finish blogpost for v1.29 (#5098)

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mkdocs.yml

@@ -173,6 +173,7 @@ nav:
         - task run: docs/commands/task-run.en.md
         - version: docs/commands/version.en.md
   - Blogs:
+      - Release v1.29: blogs/release-v129.en.md
       - Release v1.28: blogs/release-v128.en.md
       - Release v1.27: blogs/release-v127.en.md
       - AWS App Runner WAF: blogs/apprunner-waf.en.md

site/content/blogs/release-v129.en.md

@@ -9,7 +9,7 @@ image_height: '747'
 
 # AWS Copilot v1.29: Pipeline template overrides and CloudFront cache invalidation!
 
-Posted On: July 18, 2023
+Posted On: July 19, 2023
 
 The AWS Copilot core team is announcing the Copilot v1.29 release.
 
@@ -24,15 +24,20 @@ Copilot v1.29 brings big enhancements to help you develop more flexibly and effi
 
 ???+ note "What’s AWS Copilot?"
 
-    The AWS Copilot CLI is a tool for developers to build, release, and operate production ready containerized applications on AWS.
+    The AWS Copilot CLI is a tool for developers to build, release, and operate production-ready applications on AWS.
     From getting started, pushing to staging, and releasing to production, Copilot can help manage the entire lifecycle of your application development.
-    At the foundation of Copilot is AWS CloudFormation, which enables you to provision infrastructure as code.
-    Copilot provides pre-defined CloudFormation templates and user-friendly workflows for different types of micro service architectures,
+    At the foundation of Copilot is AWS CloudFormation, which enables you to provision Infrastructure as Code.
+    Copilot provides pre-defined CloudFormation templates and user-friendly workflows for different types of microservice architectures,
     enabling you to focus on developing your application, instead of writing deployment scripts.
 
     See the section [Overview](../docs/concepts/overview.en.md) for a more detailed introduction to AWS Copilot.
 
 ## Pipeline overrides
+Copilot pipelines are much more nimble and extensible with CDK and YAML path overrides! This feature provides a safe and easy way to modify your pipeline's CloudFormation template.  
+Much like the other override commands, you can run `copilot pipeline override` to customize that CloudFormation template, with the option of using either the CDK or YAML.  
+A new `--diff` flag for `copilot pipeline deploy` enables you to preview the differences between your last deployed CloudFormation template and any local changes before the deployment is executed. Copilot will confirm that you'd like to proceed; use the `--yes` flag to skip the confirmation: `copilot pipeline deploy --diff --yes`.  
+
+To learn more about overrides and to see examples, check out the [CDK overrides guide](../docs/developing/overrides/cdk.md) and [YAML patch overrides guide](../docs/developing/overrides/yamlpatch.md).
 
 ## Static Site enhancements
 For more dynamic development, Copilot will now invalidate the CloudFront edge cache each time you redeploy a Static Site workload, enabling you to see and deliver your updated content right away.