CI: debug ppp install

.github/workflows/test_sitl_rover.yml

@@ -192,7 +192,8 @@ jobs:
       - name: build rover ${{ matrix.toolchain }}
         shell: bash
         run: |
-          sudo apt-get -y install ppp
+          sudo apt-get update || true
+          sudo apt-get -y install ppp || true
           git config --global --add safe.directory ${GITHUB_WORKSPACE}
           if [[ ${{ matrix.toolchain }} == "clang" ]]; then
             export CC=clang

Tools/scripts/build_ci.sh

@@ -144,6 +144,8 @@ for t in $CI_BUILD_TARGET; do
         continue
     fi
     if [ "$t" == "sitltest-rover" ]; then
+        sudo apt-get update || /bin/true
+        sudo apt-get install -y ppp || /bin/true
         run_autotest "Rover" "build.Rover" "test.Rover"
         continue
     fi