fix(noir-ci): reinstate artifact builds

[Maddiaa0]

This pr reintroduces the old build step such that the @aztec/noir-contracts package can be published correctly.

• It changes the name of the old noir-contracts build step to noir-contracts-build to prevent the npm publish publishing the build step container rather than the artifacts container

Question:

• Ive just copied the dockerfile from every other repo, i assume its fine if i just remove formatting for the noir contracts stuff

Checklist:

Remove the checklist to signal you've completed it. Enable auto-merge if the PR is ready to merge.

• If the pull request requires a cryptography review (e.g. cryptographic algorithm implementations) I have added the 'crypto' tag.
• I have reviewed my diff in github, line by line and removed unexpected formatting changes, testing logs, or commented-out code.
• Every change is related to the PR description.
• I have linked this pull request to relevant issues (if any exist).