ci: add github actions workflow

Add running the unit tests and building the verilog output.

Signed-off-by: Michael Neuling <mikey@neuling.org>

.github/workflows/test.yml

@@ -0,0 +1,18 @@
+name: test
+on: [push]
+jobs:
+  Unittests:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - run: pip3 install 'git+https://github.com/nmigen/nmigen.git'
+      - run: pip3 install 'git+https://github.com/nmigen/nmigen-soc.git'
+      - run: python -m unittest -v
+
+  Verilog:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - run: pip install git+https://github.com/nmigen/nmigen.git#egg=nmigen[builtin-yosys]
+      - run: pip3 install 'git+https://github.com/nmigen/nmigen-soc.git'
+      - run: python -m lpcperipheral.lpcperipheral