Configure github CI

.github/workflows/ci.yaml

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+name: CI checks
+
+on: [ push, pull_request ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    name: Compilation
+
+    steps:
+    - name: Install dependencies
+      run: sudo apt-get install -y flex bison gawk tcl tcl-dev tk tk-dev libcairo2 libcairo2-dev xcb libxcb1 libxcb1-dev libxrender-dev libxpm-dev libxcb-render0-dev libx11-xcb1 libx11-xcb-dev
+    - name: Checkout source
+      uses: actions/checkout@v3
+    - name: configure
+      run: ./configure
+    - name: make
+      run: make
+    - name: Archive compiled binary
+      uses: actions/upload-artifact@v3
+      with:
+        name: xschem
+        path: src/xschem