build: github actions

Author: kleo

.github/workflows/build.yml

@@ -0,0 +1,18 @@
+name: build
+on: [push, pull_request]
+
+jobs:
+  build:
+    runs-on: ubuntu-20.04
+    steps:
+    - uses: actions/checkout@v2
+    - run: |
+        sudo apt-get install -y gcc-arm-none-eabi binutils-arm-none-eabi build-essential git python3-pip
+    - run: pip3 install -U git+https://github.com/TuxSH/firmtool.git
+    - run: make
+      env:
+        CC: arm-none-eabi-gcc
+    - uses: actions/upload-artifact@v2
+      with:
+        name: firm_linux_loader
+        path: ./firm_linux_loader.firm