remove ccache

build times are not a concern and it is not significantly improved when using ros-tooling actions

Signed-off-by: Harsh Deshpande <harshavardhan.deshpande@ipa.fraunhofer.de>

.github/workflows/main.yml

@@ -5,28 +5,8 @@ on: [push, pull_request] # on all pushes and PRs
 jobs:
   ros1_bridge:
     runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        distro: ["ros:rolling-ros1-bridge-focal"]
-    container:
-      image: ${{ matrix.distro }}
-    env:
-      CCACHE_DIR: "/home/runner/.ccache"
     steps:
       - uses: actions/checkout@v2
-      - name: install ccache
-        run: |
-          sudo apt-get update -y
-          sudo apt-get -qq -y install ccache
-      - name: ccache cache
-        uses: actions/cache@v2
-        with:
-          path: ${{ env.CCACHE_DIR }}
-          key: ccache-${{ matrix.distro }}-${{github.run_id}}
-          restore-keys: |
-            ccache-${{ matrix.distro }}
-      - name: ccache stats
-        run: ccache -s
       - uses: ros-tooling/setup-ros@v0.1
         with:
           required-ros-distributions: "noetic rolling"