Remove travis in favor of github actions (#160)

Signed-off-by: Michael Carroll <michael@openrobotics.org>

.travis/build → .github/workflows/build-and-test.sh

@@ -7,7 +7,7 @@ export CATKIN_WS_SRC=${CATKIN_WS}/src
 export DEBIAN_FRONTEND=noninteractive
 
 apt update -qq
-apt install -qq -y lsb-release wget curl
+apt install -qq -y lsb-release wget curl build-essential
 
 if [ "$IGNITION_VERSION" == "blueprint" ]; then
   IGN_DEPS="libignition-msgs4-dev libignition-transport7-dev libignition-gazebo2-dev"
@@ -49,7 +49,7 @@ rosdep install --from-paths ./ -i -y --rosdistro $ROS_DISTRO \
 # Build.
 source /opt/ros/$ROS_DISTRO/setup.bash
 mkdir -p $CATKIN_WS_SRC
-ln -s /code $CATKIN_WS_SRC
+ln -s $GITHUB_WORKSPACE $CATKIN_WS_SRC
 cd $CATKIN_WS
 catkin init
 catkin config --install

.github/workflows/melodic-ci.yml

@@ -0,0 +1,36 @@
+name: Melodic CI
+
+on: 
+  pull_request:
+  push:
+    branches:
+      - melodic 
+    schedule:
+      # Run the CI automatically once per day to look for flakyness.
+      - cron: "0 0 * * *"
+
+jobs:
+  ros_ign_ci:
+    name: ros_ign CI
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        include:
+          - docker-image: "ubuntu:18.04"
+            ignition-version: "citadel"
+            ros-distro: "melodic"
+          - docker-image: "ubuntu:18.04"
+            ignition-version: "dome"
+            ros-distro: "melodic"
+    container:
+      image: ${{ matrix.docker-image }}
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Build and Test
+        run: .github/workflows/build-and-test.sh
+        env:
+          DOCKER_IMAGE: ${{ matrix.docker-image }}
+          IGNITION_VERSION: ${{ matrix.ignition-version  }}
+          ROS_DISTRO: ${{ matrix.ros-distro }}
+