Unit test Pull Requests (speeduino#1255)

* Only need a single simulator test environment.
(now that PIO have fixed their SimAVR tooling).

* Run unit tests on PRs using SimAVR.

.github/workflows/sim-unit-tests.yml

@@ -0,0 +1,34 @@
+name: Unit Tests
+
+on:
+  # Trigger the workflow on pull request
+  pull_request:
+  # Or push to non-master branch
+  push:
+    branches-ignore: [ master ]
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+jobs:
+  Simulator-Unit-Test:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Set up Python
+      uses: actions/setup-python@v5
+      with:
+        python-version: '3.10'
+
+    - name: Install PlatformIO
+      run: |
+        python -m pip install --upgrade pip
+        pip install --upgrade platformio
+        pip install wheel
+        platformio upgrade
+        platformio pkg update
+
+    - name: Run Simulator Unit Tests
+      run: | 
+        platformio test -v -e megaatmega2560_sim_unittest

platformio.ini

@@ -35,9 +35,6 @@ build_flags = ${env:megaatmega2560.build_flags} -DINJ_CHANNELS=8 -DIGN_CHANNELS=
 [env:megaatmega2560_sim_unittest]
 extends = env:megaatmega2560
 build_src_flags =  ${env:megaatmega2560.build_src_flags} -DSIMULATOR
-
-[env:megaatmega2560_sim_unittest_windows]
-extends = env:megaatmega2560_sim_unittest
 build_type = test
 platform_packages =
     platformio/tool-simavr
@@ -52,21 +49,6 @@ test_testing_command =
     16000000L
     ${platformio.build_dir}/${this.__env__}/firmware.elf
 
-[env:megaatmega2560_sim_unittest_ubuntu]
-; PlatformIO SimAvr package doesn't run in Ubuntu:
-;   error while loading shared libraries: libsimavr.so.1: cannot open shared object file: No such file or directory
-;
-; So instead we manually install SimAVR ('sudo apt-get install -y simavr')
-; and run the unit tests using that instead.
-extends = env:megaatmega2560_sim_unittest_windows
-test_testing_command =
-    simavr
-    -m
-    atmega2560
-    -f
-    16000000L
-    ${platformio.build_dir}/${this.__env__}/firmware.elf
-
 [env:megaatmega2561]
 extends = env:megaatmega2560
 board=ATmega2561