Added CI

Added a build ci to see if new commits still work

.github/workflows/workflow.yml

@@ -0,0 +1,32 @@
+name: CI
+on:
+  push:
+  release:
+    types:
+      - created
+#  pull_request:
+#    types: [opened, synchronize, reopened]
+
+# checkout, install make and try to build
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        config: [motortest, motortest_peter, feedcode-front, feedcode-back, greyhash]
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          submodules: 'true'
+
+      - name: Install make
+        run: |
+          sudo apt update -y
+          sudo apt install -y binutils-arm-none-eabi gcc-arm-none-eabi libnewlib-arm-none-eabi cmake make
+          
+      - name: Build
+        run: |
+          cmake -DCMAKE_BUILD_TYPE=Release .
+          make -j$(nproc) ${{ matrix.config }}