fix(ci): ensure CMake >= 3.5 is installed for lnd_grpc_rust tests

Add a step to the CI workflow to check and install CMake if it’s missing or below version 3.5.
This fixes the build failure in the LND integration tests caused by prost-build v0.10.4,
which requires CMake >= 3.5. Since ubuntu-latest is not a fixed version, this ensures
compatibility with potential future changes in the runner environment.

Closes lightningdevkit#515

Author: moisesPompilio

.github/workflows/lnd-integration.yml

@@ -9,6 +9,20 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v4
 
+      - name: Verify CMake version
+        run: cmake --version
+
+      - name: Check and install CMake if needed
+        # lnd_grpc_rust (via prost-build) requires CMake >= 3.5.
+        # Since ubuntu-latest is not a fixed version,
+        # a future update could include a lower CMake version.
+        # This step ensures the correct version is installed.
+        run: |
+          if ! command -v cmake &> /dev/null || [ "$(cmake --version | head -n1 | cut -d' ' -f3)" \< "3.5" ]; then
+            sudo apt-get update
+            sudo apt-get install -y cmake
+          fi
+
       - name: Create temporary directory for LND data
         id: create-temp-dir
         run: echo "LND_DATA_DIR=$(mktemp -d)" >> $GITHUB_ENV