fix missing .git directory

c.f actions/checkout#335 (comment)

.github/workflows/ci.yml

@@ -30,12 +30,22 @@ jobs:
           - TEST : debian-unstable
             DOCKER_IMAGE : debian:unstable
     steps:
+      - name: Setup OS
+        run: |
+          sudo apt-get update -y
+          sudo apt-get upgrade -y
+      - name: Setup Git
+        run: |
+          sudo apt-get install -y git
       - name: Chcekout
         uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+          submodules: recursive
       # python3_check
       - name: python3_check
         if: matrix.CHECK_PYTHON3_COMPILE  == true
-        run: python3 -m compileall .
+        run: pwd; ls -al; git diff; python3 -m compileall .
       # catkin_lint
       - name: catkin_lint setup
         if: matrix.TEST == 'catkin_lint'
@@ -62,4 +72,4 @@ jobs:
       - name: script
         if: matrix.DOCKER_IMAGE
         run: |
-          docker run --rm -i -v $PWD:$PWD -e "CI_SOURCE_PATH=$PWD" -e "HOME=$HOME" -e "ROS_DISTRO=${{ matrix.ROS_DISTRO }}" -e "OPENCV_VERSION=${{ matrix.OPENCV_VERSION }}" -e "TEST=${{ matrix.TEST }}" ${{ matrix.DOCKER_IMAGE }} sh -c "cd $PWD; /bin/bash .travis.sh"
+          docker run --rm -i -v $PWD:$PWD -e "CI_SOURCE_PATH=$PWD" -e "HOME=$HOME" -e "ROS_DISTRO=${{ matrix.ROS_DISTRO }}" -e "OPENCV_VERSION=${{ matrix.OPENCV_VERSION }}" -e "TEST=${{ matrix.TEST }}" ${{ matrix.DOCKER_IMAGE }} sh -c "cd $PWD; ls -al; /bin/bash .travis.sh"

.travis.sh

@@ -163,8 +163,10 @@ elif [ "$TEST" == "clang-tidy" ]; then
 	    run-clang-tidy -fix -p $(dirname $file)
     done
     travis_time_end
-    git -C $CI_SOURCE_PATH --no-pager diff
-    git -C $CI_SOURCE_PATH diff-index --quiet HEAD -- .
+    ls -al $CI_SOURCE_PATH
+    ls -al $CI_SOURCE_PATH/.git/
+    ( cd $CI_SOURCE_PATH; git --no-pager diff )
+    ( cd $CI_SOURCE_PATH; git diff-index --quiet HEAD -- . )
 
 elif [ "$TEST" == "debian-unstable" ]; then