Add github action

Signed-off-by: wep21 <border_goldenmarket@yahoo.co.jp>

Author: wep21

.github/workflows/build_and_test.yml

@@ -0,0 +1,45 @@
+name: ROS2 CI
+
+on:
+  pull_request:
+    branches:
+      - 'ros2'
+
+jobs:
+  test_environment:
+    runs-on: [ubuntu-latest]
+    strategy:
+      fail-fast: false
+      matrix:
+        ros_distribution:
+          - foxy
+          - galactic
+          - rolling
+        include:
+          # Foxy Fitzroy (June 2020 - May 2023)
+          - docker_image: rostooling/setup-ros-docker:ubuntu-focal-ros-foxy-ros-base-latest
+            ros_distribution: foxy
+            ros_version: 2
+          # Galactic Geochelone (May 2021 - November 2022)
+          - docker_image: rostooling/setup-ros-docker:ubuntu-focal-ros-galactic-ros-base-latest
+            ros_distribution: galactic
+            ros_version: 2
+          # Rolling Ridley  (June 2020 - Present)
+          - docker_image: rostooling/setup-ros-docker:ubuntu-focal-ros-rolling-ros-base-latest
+            ros_distribution: rolling
+            ros_version: 2
+    container:
+      image: ${{ matrix.docker_image }}
+    steps:
+      - name: setup directories
+        run: mkdir -p ros_ws/src
+      - name: checkout
+        uses: actions/checkout@v2
+        with:
+          path: ros_ws/src
+      - name: build and test
+        uses: ros-tooling/action-ros-ci@master
+        with:
+          package-name: octomap_ros
+          target-ros2-distro: ${{ matrix.ros_distribution }}
+          vcs-repo-file-url: ""