add basic CI

Author: vk2seb

.github/workflows/main.yml

@@ -0,0 +1,15 @@
+name: build
+
+on: [push]
+
+jobs:
+  ubuntu-build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - run: sudo apt install verilator
+      - run: verilator --version
+      - run: wget https://vcvrack.com/downloads/Rack-SDK-latest-lin-x64.zip
+      - run: unzip Rack-SDK*.zip && rm Rack-SDK*.zip
+      - run: export RACK_DIR=`pwd`/Rack-SDK/
+      - run: make