ci: MemBrowse Integration

[michael-membrowse]

Re-opening of #18774, which was closed and could not be reopened because the branch was rebased onto a newer apache/nuttx:master. Same content as before, rebased on current master.

Summary

Integrates MemBrowse memory footprint tracking into NuttX CI to automatically report firmware memory footprint across a representative set of boards on every PR and push to master.

• Adds .github/membrowse-targets.json: tracks 9 boards spanning all supported architectures
  • ARM Cortex-M/A
  • AVR
  • MIPS
  • RISC-V
  • RX
  • SPARC
  • x86_64
  • Xtensa
• Adds membrowse-report.yml: builds NuttX on the above targets and runs membrowse-action to generate and upload the reports
• Adds membrowse-comment.yml: posts a memory-diff comment on PRs after the report workflow finishes
• Adds membrowse-onboard.yml: manual workflow to backfill the last N commits per target
• Adds a MemBrowse badge to README.md for easy access to the MemBrowse NuttX dashboard

Setup

To view the memory dashboard and receive PR comments:

1. Create an account and a project at https://membrowse.com.
2. Copy the project's API key.
3. In the MemBrowse project settings set the dashboard as publicly available.
4. In the GitHub repo, add it as a secret named MEMBROWSE_API_KEY.

Testing

The integration has been running on a fork. See the live dashboard here:
https://membrowse.com/public/michael-membrowse/nuttx

[michael-membrowse]

reopening the PR, by request of @xiaoxiang781216 and @acassis

[lupyuen]

MemBrowse failed to start. That's because ASF Infra Team has disallowed Third Party GitHub Actions, to prevent supply-chain attacks: https://github.com/apache/nuttx/actions/runs/25633744705

The actions dorny/paths-filter@v3 and membrowse/membrowse-action@v1 are not allowed in apache/nuttx because all actions must be from a repository owned by your enterprise, created by GitHub, or match one of the patterns...

[michael-membrowse]

@lupyuen Pushed a change - calling the membrowse python package directly, instead of using an action. Should work now.
Please create an account on membrowse.com, create a project and set a github secret: MEMBROWSE_API_KEY to the generated api key.

[lupyuen]

Please create an account on membrowse.com, create a project and set a github secret: MEMBROWSE_API_KEY to the generated api key.

@hartmannathan Are we legally allowed to accept MemBrowse's Terms Of Use, on behalf of the Apache NuttX Project?

• https://membrowse.com/terms