Containerize C# Pubsub Quickstart

[marcduiker]

Description

This is a work-in-progress

Added Dockerfiles and deployment files to run the C# Pubsub QS on Kubernetes.

Issue reference

We strive to have all PRs being opened based on an issue, where the problem or feature have been discussed prior to implementation.

Please reference the issue this PR will close: #1046

Checklist

Please make sure you've completed the relevant tasks for this PR, out of the following list:

• The quickstart code compiles correctly
• You've tested new builds of the quickstart if you changed quickstart code
• You've updated the quickstart's README if necessary
• If you have changed the steps for a quickstart be sure that you have updated the automated validation accordingly. All of our quickstarts have annotations that allow them to be executed automatically as code. For more information see mechanical-markdown. For user guide with examples see Examples.

[paulyuk]

This is cool @marcduiker. Can we think about how these images get published? I think we'd want them to go to ghcr.io like tutorials/hello-kubernetes images so you can simply apply on kubernetes.

[paulyuk]

Could we please consider building and pushing this to ghcr, and applying with images from ghcr? please see tutorials/hello-kubernetes. happy to discuss

[paulyuk]

Also @marcduiker - C# has built in support to create dockerfiles and kubernetes files as an output of dotnet publish. any chance you could explore this? It will keep it cleaner and still accomplish the scenario, the C# way.

You can build and deploy a C# project for containers and Kubernetes without using a Dockerfile by leveraging the built-in container support in the .NET SDK. Here are a few methods to achieve this:

1. **Using `dotnet publish`**:
   - The `dotnet publish` command can be used to create a container image directly. This method simplifies the process by eliminating the need for a Dockerfile.
   - Example command:
     ```bash
     dotnet publish -c Release -o ./app --use-container
     ```
   - [This command builds your .NET application and packages it into a container image](https://learn.microsoft.com/en-us/dotnet/core/docker/publish-as-container)².

2. **Using Build Scripts**:
   - You can create build scripts to automate the containerization process. These scripts can handle building, publishing, and packaging your application into a container.
   - Example build script (`build.sh`):
     ```bash
     #!/bin/bash
     # Build the .NET application
     dotnet build
     # Publish the application
     dotnet publish -c Release -o ./app
     # Build the Docker image
     docker build -t my-dotnet-app .
     ```
   - This script builds and publishes your .NET application, then packages it into a Docker image¹.

3. **Built-In Container Support in .NET 7**:
   - The .NET 7 SDK includes built-in support for creating Docker images without needing a Dockerfile. This feature simplifies the containerization process.
   - Example command:
     ```bash
     dotnet publish --os linux --arch x64 -c Release -p:PublishProfile=DefaultContainer
     ```
   - This command builds and publishes your .NET application as a container image³.

These methods allow you to containerize your C# project efficiently without the need for a Dockerfile. If you have any more questions or need further assistance, feel free to ask!

Source: Conversation with Copilot, 7/28/2024
([1](https://learn.microsoft.com/en-us/dotnet/core/docker/publish-as-container)) Containerize an app with dotnet publish - .NET | Microsoft Learn. https://learn.microsoft.com/en-us/dotnet/core/docker/publish-as-container.
(2) How to deploy a .NET App as a container without a Dockerfile?. https://dev.to/bytehide/how-to-deploy-a-net-app-as-a-container-without-a-dockerfile-3jca.
(3) Built-In Container Support for .NET 7 - Dockerize .NET Applications .... https://codewithmukesh.com/blog/built-in-container-support-for-dotnet-7/.
(4) Look ma, no Dockerfile! - Publishing containers with the .NET SDK. https://blog.martincostello.com/look-ma-no-hands-publishing-containers-with-the-dotnet-sdk/.

[marcduiker]

Also @marcduiker - C# has built in support to create dockerfiles and kubernetes files as an output of dotnet publish. any chance you could explore this? It will keep it cleaner and still accomplish the scenario, the C# way.

You can build and deploy a C# project for containers and Kubernetes without using a Dockerfile by leveraging the built-in container support in the .NET SDK. Here are a few methods to achieve this:

1. **Using `dotnet publish`**:
   - The `dotnet publish` command can be used to create a container image directly. This method simplifies the process by eliminating the need for a Dockerfile.
   - Example command:
     ```bash
     dotnet publish -c Release -o ./app --use-container
     ```
   - [This command builds your .NET application and packages it into a container image](https://learn.microsoft.com/en-us/dotnet/core/docker/publish-as-container)².

2. **Using Build Scripts**:
   - You can create build scripts to automate the containerization process. These scripts can handle building, publishing, and packaging your application into a container.
   - Example build script (`build.sh`):
     ```bash
     #!/bin/bash
     # Build the .NET application
     dotnet build
     # Publish the application
     dotnet publish -c Release -o ./app
     # Build the Docker image
     docker build -t my-dotnet-app .
     ```
   - This script builds and publishes your .NET application, then packages it into a Docker image¹.

3. **Built-In Container Support in .NET 7**:
   - The .NET 7 SDK includes built-in support for creating Docker images without needing a Dockerfile. This feature simplifies the containerization process.
   - Example command:
     ```bash
     dotnet publish --os linux --arch x64 -c Release -p:PublishProfile=DefaultContainer
     ```
   - This command builds and publishes your .NET application as a container image³.

These methods allow you to containerize your C# project efficiently without the need for a Dockerfile. If you have any more questions or need further assistance, feel free to ask!

Source: Conversation with Copilot, 7/28/2024
([1](https://learn.microsoft.com/en-us/dotnet/core/docker/publish-as-container)) Containerize an app with dotnet publish - .NET | Microsoft Learn. https://learn.microsoft.com/en-us/dotnet/core/docker/publish-as-container.
(2) How to deploy a .NET App as a container without a Dockerfile?. https://dev.to/bytehide/how-to-deploy-a-net-app-as-a-container-without-a-dockerfile-3jca.
(3) Built-In Container Support for .NET 7 - Dockerize .NET Applications .... https://codewithmukesh.com/blog/built-in-container-support-for-dotnet-7/.
(4) Look ma, no Dockerfile! - Publishing containers with the .NET SDK. https://blog.martincostello.com/look-ma-no-hands-publishing-containers-with-the-dotnet-sdk/.

Oh, this is nice, yes I'll check this.