ci: setup ci variables

[JossWhittle]

🚧 Suggest a change

Set up ci vars.

📝 Pre-merge checklist

Ready to merge? Do not merge until all checks are satisfied.

• 💹 Have all required CI checks passed on the most recent commit?
• ✒️ Is the PR title a valid and meaningful conventional-commit message? ie. type(scope): summary
• 💥 Are breaking changes declared in the PR title in conventional-commit style? ie. type!(scope): summary
• 🎨 Does new code follow the code style of this project?
• 🔍 Has new code been spellchecked and linted?
• 📖 Have docs been updated where necessary?
• 💩 Have commits been checked for accidental file inclusions?

[github-actions]

✒️ PR Title Commitlint - ✔️ Lint success!

[github-actions]

🛠️ 🐳 Build PR Container - assign-container - 🏷️ Commit: dfa240c - ⚙️ Workflow: 11500325217

harbor.ukserp.ac.uk/dlm/assign:pr-1
harbor.ukserp.ac.uk/dlm/assign:pr-1-dfa240c
sha256:dd4f5e674b2dbe3601439c1b5fa2f7052948148dc906c45a51d47eceb2e4fa13