Compiler Explorer's CI infrastructure

Used to build our compilers, both ad hoc and on a regular basis. Uses https://github.com/philips-labs/terraform-aws-github-runner to script up some custom GH Actions runners that run on our infrastructure on demand, and scale back to zero when they're done. Our runners have access to the CE environment and they are mostly set up by the infra repo.

To deploy:

Fetch the lambdas

• cd lambdas-download
• terraform init
• terraform apply
• cd ..

Do the needful

• terraform init
• terraform apply

The webhook and secret should be the same every time, but they go in https://github.com/organizations/compiler-explorer/settings/apps/compiler-explorer-ci. If you need to output them you need to specifically ask them to be output as they are sensitive secret values, shared with GitHub only:

$ terraform output webhook

To update the packer image

• Make any changes in the ./packer directory, as needed.
• Then ./build-image.sh and ./build-image-arm64.sh.
• Once built you'll need to rerun the terraform apply.

To update the version of the philips code

• update the version in lambdas-download/main.tf
• terraform apply in lambdas-download
• update the version in main.tf
• terraform init in toplevel and terraform apply

To update the GH Actions Runner version

• update the runner_version in packer-vars.hcl and packer-vars-arm64.hcl
• update the packer images (see above)