Use action-ignition-ci

Revives gazebosim#266.

Signed-off-by: Steve Peters <scpeters@openrobotics.org>

.github/ci/after_make.sh

@@ -0,0 +1,14 @@
+#!/bin/sh -l
+
+set -x
+
+# Install
+make install
+
+# Compile examples
+cd ../examples
+mkdir build;
+cd build;
+cmake ..;
+make;
+./simple ../simple.sdf;

.github/ci/between_cmake_make.sh

@@ -0,0 +1,5 @@
+#!/bin/sh -l
+
+set -x
+
+make sdf_descriptions

.github/workflows/ci-bionic.yml

@@ -0,0 +1,17 @@
+name: Ubuntu Bionic CI
+
+on: [push, pull_request]
+
+jobs:
+  bionic-ci:
+    runs-on: ubuntu-latest
+    name: Ubuntu Bionic CI
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Bionic CI
+        id: ci
+        uses: ignition-tooling/action-ignition-ci@master
+        with:
+          codecov-token: ${{ secrets.CODECOV_TOKEN }}
+