Add initial system-libs workflow

Author: alcaeus

.github/workflows/system-libs.yml

@@ -0,0 +1,33 @@
+name: "System library tests"
+
+on:
+  push:
+    branches:
+      - "build-system-libs"
+
+env:
+  LIBMONGOC_VERSION: "2.0.1"
+
+jobs:
+  tests:
+    name: "Build"
+    runs-on: "ubuntu-24.04"
+
+    steps:
+      - name: "Checkout"
+        uses: "actions/checkout@v4"
+        with:
+          submodules: true
+
+      - name: Install libmongoc as system library
+        shell: bash
+        working-directory: /tmp
+        run: |
+          wget "https://github.com/mongodb/mongo-c-driver/archive/refs/tags/${LIBMONGOC_VERSION}.tar.gz" --output-document="mongo-c-driver.tar.gz"
+          tar xf "mongo-c-driver.tar.gz"
+          cmake -S mongo-c-driver -B _build \
+            -D CMAKE_BUILD_TYPE=RelWithDebInfo \
+            -D BUILD_VERSION="${LIBMONGOC_VERSION}" \
+            -D ENABLE_MONGOC=ON
+          cmake --build _build --config RelWithDebInfo --parallel
+          cmake --install _build --prefix "~/.local" --config RelWithDebInfo