CI: setup gitea actions ci

.gitea/workflows/build.yml

@@ -0,0 +1,16 @@
+name: Build eismuliplexer for linux
+run-name: Building eismuliplexer for linux
+on: [push]
+
+jobs:
+  Build:
+    runs-on: ubuntu-20.04
+    steps:
+      - name: Install dependancies
+        run: apt update; apt install -y libusb-dev cmake
+      - name: Check out repository code
+        uses: ischanx/checkout@8c80eac3058d03dc5301629e8f7d59ae255d6cc3
+      - name: Build
+        run: mkdir ${{ gitea.workspace }}/build; cd ${{ gitea.workspace }}/build; cmake ..; make
+      - name: List files in the build dir
+        run: ls