chore: update to OIDC publishing

[ryjones]

Checklist

This is to update from token publishing to OIDC publishing.

Issue/User story

Steps to Reproduce

Existing issues

Design of the fix

Validation of the fix

Automated Tests

What documentation has been provided for this pull request

[aklenik]

@ryjones left a minor suggestion, just to be explicit with the used versions

[aklenik]

I'd add these explicit steps (taken from the official docs at https://docs.npmjs.com/trusted-publishers#github-actions-configuration) before the "Publish Caliper" step, so we're sure that we have the required npm version (I couldn't find what npm version comes with 18.x when using setup-node):

# Ensure npm 11.5.1 or later is installed
- name: Update npm
  run: npm install -g npm@latest
- run: npm ci
- run: npm run build --if-present
- run: npm test
- run: npm publish
# rest is unchanged
- name: Publish Caliper

[ryjones]

does this look good now?

[aklenik]

@ryjones I think the new block should go between L27-28 (according to the current commit, L15-16 in the previous version), just after the setup-node step

[aklenik]

@ryjones The structure seems okay now, but I also copied some unnecessary steps in the example, when we only need the npm update step.

The whole steps section should look like this (don't want to mess with your commit directly as a reviewer, I don't know how that would affect the PR workflow):

steps:
    - uses: actions/checkout@v4
    - name: Use Node.js 18.x
      uses: actions/setup-node@v4
      with:
        node-version: 18.x
    # anchor to the smallest npm version supporting trusted publishing
    - name: Update npm
      run: npm install -g npm@11.5.1
    - name: Publish Caliper
      run: .build/publish-caliper.sh

[aklenik]

LGTM :)