Add salesforce to action

[dschach]

TL;DR

Salesforce (SFDX) was added to release-please.
Please add it as an option for the GitHub action.

Detailed design

No response

Additional information

Run google-github-actions/release-please-action@v3
❯ Fetching release-please-config.json from branch main
❯ Fetching .release-please-manifest.json from branch main
✔ Building pull requests
✔ Building strategies by path
❯ force-app: salesforce
Error: release-please failed: core (/): Unknown release type: salesforce