add matrix for espressif platforms

Author: brentru

.github/workflows/githubci.yml

@@ -7,9 +7,8 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        arduino-platform: ["esp8266", "esp32",
-                           "pyportal_titano", "metro_m4_airliftlite",
-                           "uno"]
+        arduino-platform: ["pyportal_titano", "metro_m4_airliftlite", "uno"]
+        espressif-platform: ["esp8266", "esp32"]
 
     runs-on: ubuntu-latest
 
@@ -26,11 +25,16 @@ jobs:
     - name: pre-install
       run: bash ci/actions_install.sh
 
+    # test espressif platforms
+    - name: test esp platforms
+      run: python3 ci/build_platform.py ${{ matrix.espressif-platform }}
+
     # manually install WiFi
     - name: extra libraries
       run: |
         git clone --quiet https://github.com/adafruit/WiFiNINA.git /home/runner/Arduino/libraries/WiFiNINA
 
+    # test non-espressif platforms
     - name: test platforms
       run: python3 ci/build_platform.py ${{ matrix.arduino-platform }}