containerize mastodonctl in a Docker image (Dockerfile)

[socraticDevBlog]

as a dev, i want to be able to build and use mastodonctl as a Docker image

what to do

• in Dockerfile, containerize the app
• document how to use that container image locally

[socraticDevBlog]

Entrypoint should be mastodonctl

i.e. this image should be purpose built to run mastodonctl, nothing else

[socraticDevBlog]

ive chatgpted the request (adapt to mastodonctl of course)

Containerizing a Go (Golang) CLI app is a great way to package your application along with its dependencies and runtime environment, making it portable and easily deployable across different platforms. You can use Docker to create a container for your Go CLI app. Here are the steps to containerize a Golang CLI app:

1. Install Docker: If you haven't already, install Docker on your development machine. You can download Docker from the official website (https://www.docker.com/).

2. Create a Dockerfile: You need to create a Dockerfile to define how your Go CLI app should be containerized. Create a text file named Dockerfile in the root directory of your Go app. Here's a basic example of a Dockerfile for a Go app:

   # Use an official Go runtime as a parent image
   FROM golang:1.17
   
   # Set the working directory inside the container
   WORKDIR /app
   
   # Copy the Go module and Go source code
   COPY go.mod go.sum ./
   COPY main.go .
   
   # Download and install any dependencies
   RUN go mod download
   
   # Build the Go application
   RUN go build -o myapp
   
   # Expose the port the application uses
   EXPOSE 8080
   
   # Command to run the application
   CMD ["./myapp"]

   This Dockerfile uses the official Go Docker image as a base image, sets the working directory, copies the source code and Go module files, installs dependencies, builds the Go application, exposes a port (if needed), and specifies the command to run the application.

3. Build the Docker Image: Open a terminal in the directory containing your Dockerfile and run the following command to build the Docker image:

   docker build -t my-golang-app .

   Replace my-golang-app with a name for your Docker image.

4. Run the Docker Container: You can now run a Docker container from the image you built using the following command:

   docker run my-golang-app

   This will start a container running your Go CLI app.

5. Testing and Debugging: Ensure that your CLI app works as expected within the Docker container. You can make adjustments to the Dockerfile or your application code as needed.

6. Distribute Your Container: You can distribute your Docker image to other systems or a container registry like Docker Hub, Google Container Registry, or Amazon Elastic Container Registry.

Keep in mind that this is a basic example. Depending on the specific requirements of your Go CLI app, you may need to customize your Dockerfile, including handling environment variables, secrets, and additional configurations.

Additionally, it's a good practice to create a .dockerignore file to exclude unnecessary files from being copied into the Docker image to keep it as small as possible.