ci: remove dangling esp8266 include block

[forntoh]

Summary

• Removes the dangling esp8266 include block from the Compile Examples workflow matrix.

Why

Since bbd2b8f ("Remove esp8266 board configuration from compile workflow") removed the esp8266 matrix board entry, the leftover include block (no fqbn, empty libraries/sketch-paths) has spawned a broken esp8266 job on every workflow run — it fails with IndexError: list index out of range before compiling anything (see the failed job on #433 and #434). That commit's own verification run was cancelled, so the breakage went unnoticed.

This completes the original removal intent and un-breaks the compile workflow for all current and future PRs.

Verification

• git diff: only the 9-line esp8266 include block removed; the four board matrix entries (esp32, avr:uno, mkr1000, stm32) and all remaining include blocks (AVR, ESP32, SAMD, STM32) are untouched.
• YAML validated: yaml.safe_load (temp venv) and independently via ruby YAML.load_file — both pass.

Notes

• If the esp8266 compile job is listed as a required status check in branch protection, that repository setting should be updated after this merges.
• After this merges, open PRs with a recorded failed esp8266 job (e.g. fix: make GraphicalDisplayRenderer subclassable #433) may need a branch update to re-run checks.

Summary by CodeRabbit

• Chores
  • Automated build validation no longer includes ESP8266 board configurations. This changes which board builds are checked automatically; it does not describe a change to the behavior of existing devices.

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📥 Commits

Reviewing files that changed from the base of the PR and between 56bfce7 and b99e5c1.

📒 Files selected for processing (1)

• .github/workflows/compile-arduino.yml

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