Disable build cache for Github Actions

.github/workflows/examples.yml

@@ -25,7 +25,6 @@ jobs:
       - name: Run on Linux
         if: startsWith(matrix.os, 'ubuntu')
         env:
-          PLATFORMIO_BUILD_CACHE_DIR: /tmp/pio
           PIO_INSTALL_DEVPLATFORMS_IGNORE: "ststm8,infineonxmc,intel_mcs51,aceinna_imu"
         run: |
           # ChipKIT issue: install 32-bit support for GCC PIC32
@@ -40,7 +39,6 @@ jobs:
       - name: Run on macOS
         if: startsWith(matrix.os, 'macos')
         env:
-          PLATFORMIO_BUILD_CACHE_DIR: /tmp/pio
           PIO_INSTALL_DEVPLATFORMS_IGNORE: "ststm8,infineonxmc,microchippic32,gd32v,nuclei"
         run: |
           df -h
@@ -50,7 +48,6 @@ jobs:
         if: startsWith(matrix.os, 'windows')
         env:
           PLATFORMIO_CORE_DIR: C:/pio
-          PLATFORMIO_BUILD_CACHE_DIR: C:/pio/tmp
           PIO_INSTALL_DEVPLATFORMS_IGNORE: "ststm8,infineonxmc,riscv_gap"
         run: |
           tox -e testexamples

platformio/telemetry.py

@@ -315,7 +315,15 @@ def on_exception(e):
 
 def measure_ci():
     event = {"category": "CI", "action": "NoName", "label": None}
-    known_cis = ("TRAVIS", "APPVEYOR", "GITLAB_CI", "CIRCLECI", "SHIPPABLE", "DRONE")
+    known_cis = (
+        "GITHUB_ACTIONS",
+        "TRAVIS",
+        "APPVEYOR",
+        "GITLAB_CI",
+        "CIRCLECI",
+        "SHIPPABLE",
+        "DRONE",
+    )
     for name in known_cis:
         if os.getenv(name, "false").lower() == "true":
             event["action"] = name