ci: Add build workflow

.github/workflows/build.yml

@@ -0,0 +1,18 @@
+env:
+  DEPS: build-essential meson git libglib libglib2.0-dev libedit-dev
+
+name: Build eigenvalue
+run-name: Build on ${{ github.actor }}
+on: [push]
+jobs:
+  Build-gcc:
+    runs-on: ubuntu-24.04
+    steps:
+      - uses: actions/checkout@v4
+      - name: Install deps
+        run: sudo apt -y install $DEPS
+      - name: setup
+        run: meson setup _build
+      - name: build
+        run: meson compile -C _build
+