Prebuilding the container will result in much faster start-up times for the container.

• Get an access token from the jointheleague-it account, with the package permissions. See this guide for details.
• Store the token for future use, here is it GITHUB_TOKEN but it can be any env var.
• Login to the GH Container Registry: echo $GITHUB_TOKEN | docker login ghcr.io -u jointheleague-it --password-stdin
• Read the brief guide to prebuilding. Be sure to install the decvontainer program with npm.
• Build the container
• Push it to container registry.

# Install
npm install -g @devcontainers/cli

# Go to the workspace. 
cd <workspace, with a .devcontainer>

# Build
devcontainer build --workspace-folder . --image-name ghcr.io/league-infrastructure/jtlpython:latest

#Login to container registry
echo $GITHUB_TOKEN | docker login ghcr.io -u jointheleague-it  --password-stdin

# Push
docker push ghcr.io/league-infrastructure/jtlpython:latest

The package will be in the packages tab of the League-Infrastructure repo, https://github.com/orgs/league-infrastructure/packages