CI: added some "basic" GitHub Actions.

.github/workflows/ci.yml

@@ -192,3 +192,28 @@ jobs:
           cd build
           ninja llvm_coverage
           if [ `ninja llvm_coverage | grep TOTAL | sed 's/ /\n/g' | grep "100.00%" | wc -l | sed 's/ //g'` -eq 4 ]; then exit 0; else exit 1; fi
+  memory_leaks:
+    name: Memory leaks
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+    steps:
+      - name: Check out libCellML
+        uses: actions/checkout@v4
+      - name: Install CMake and Ninja
+        uses: lukka/get-cmake@latest
+      - name: Install buildcache
+        uses: mikehardy/buildcache-action@v2
+      - name: Install Valgrind
+        run: |
+          sudo apt update
+          sudo apt install valgrind
+      - name: Configure libCellML
+        run: |
+          mkdir build
+          cd build
+          cmake -G Ninja -DBINDINGS_PYTHON=OFF ..
+      - name: Memory leaks
+        run: |
+          cd build
+          ninja memcheck