ci: add GitHub Actions workflow for build and test

Runs on Ubuntu 22.04/24.04 with g++ and clang++, plus macOS.
Builds libsqlparser.a and runs all tests via Makefile.new.

Author: renecannao

.github/workflows/ci.yml

@@ -0,0 +1,30 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  build-and-test:
+    strategy:
+      matrix:
+        os: [ubuntu-22.04, ubuntu-24.04]
+        compiler: [g++, clang++]
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Build and test
+        env:
+          CXX: ${{ matrix.compiler }}
+        run: make -f Makefile.new clean && make -f Makefile.new all
+
+  macos:
+    runs-on: macos-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Build and test
+        run: make -f Makefile.new clean && make -f Makefile.new all