This repo holds my custom image for Bluefin.

This workflow creates your custom OCI image and publishes it to the Github Container Registry (GHCR). By default, the image name will match the Github repository name.

Container signing is important for end-user security and is enabled on all Universal Blue images. It is recommended you set this up, and by default the image builds will fail if you don't.

This provides users a method of verifying the image.

1. Install the cosign CLI tool

2. Run inside your repo folder:

   cosign generate-key-pair

   • Do NOT put in a password when it asks you to, just press enter. The signing key will be used in GitHub Actions and will not work if it is encrypted.

3. Add the private key to GitHub

   • This can also be done manually. Go to your repository settings, under Secrets and Variables -> Actions Add a new secret and name it SIGNING_SECRET, then paste the contents of cosign.key into the secret and save it. Make sure it's the .key file and not the .pub file. Once done, it should look like this:

   • (CLI instructions) If you have the github-cli installed, run:

   gh secret set SIGNING_SECRET < cosign.key

4. Commit the cosign.pub file into your git repository