Install ccache

Author: christophfroehlich

.github/workflows/ci.yaml

@@ -45,7 +45,7 @@ jobs:
       - name: Install dependencies
         run: |
           sudo apt update
-          sudo apt install -y lld
+          sudo apt install -y lld ccache
       - name: Source ROS
         run: |
           . /opt/ros/${{ matrix.ros_distro }}/setup.sh
@@ -96,7 +96,7 @@ jobs:
       - name: Install dependencies
         run: |
           sudo apt update
-          sudo apt install -y lld
+          sudo apt install -y lld ccache
       - uses: ros-tooling/action-ros-ci@0.4.5
         with:
           package-name: rsl