ci.yml now pins PIOArduino Core to v6.1.19, replaces deprecated pio platform install

Author: zekageri

.github/workflows/ci.yml

@@ -60,15 +60,15 @@ jobs:
         uses: actions/cache@v4
         with:
           path: ~/.platformio
-          key: ${{ runner.os }}-platformio-${{ hashFiles('**/library.json') }}
+          key: ${{ runner.os }}-platformio-pioarduino-6.1.19-${{ hashFiles('**/library.json') }}
           restore-keys: |
-            ${{ runner.os }}-platformio-
+            ${{ runner.os }}-platformio-pioarduino-6.1.19-
 
       - name: Install PIOArduino Core
-        run: python -m pip install --upgrade https://github.com/pioarduino/platformio-core/archive/refs/tags/v6.1.18.zip
+        run: python -m pip install --upgrade https://github.com/pioarduino/platformio-core/archive/refs/tags/v6.1.19.zip
 
       - name: Install PIOArduino ESP32 Platform
-        run: pio platform install https://github.com/pioarduino/platform-espressif32.git
+        run: pio pkg install -g -p https://github.com/pioarduino/platform-espressif32.git
 
       - name: Build library examples (ESP32 Arduino)
         run: |
@@ -146,7 +146,7 @@ jobs:
           python-version: '3.13'
 
       - name: Install PIOArduino Core
-        run: python -m pip install --upgrade https://github.com/pioarduino/platformio-core/archive/refs/tags/v6.1.18.zip
+        run: python -m pip install --upgrade https://github.com/pioarduino/platformio-core/archive/refs/tags/v6.1.19.zip
 
       - name: Pack library (PlatformIO)
         run: |

CHANGELOG.md

@@ -12,6 +12,9 @@ All notable changes to this project will be documented in this file.
 - Standalone CMake now consistently requires C++17 and builds tests against the root library target.
 - README now documents the `format(...)` format-string contract and standalone CMake consumption.
 
+### Fixed
+- CI now pins PIOArduino Core to `v6.1.19` and installs the ESP32 platform via `pio pkg install`, restoring PlatformIO compatibility with the current `platform-espressif32` package.
+
 ## [0.1.0] - 2026-04-09
 ### Added
 - Initial ESPLang release.