Adding github actions CI (#4)

* CI will run on pushes to the main branch.

.github/workflows/main.yml

@@ -0,0 +1,26 @@
+name: CI
+
+on: [push]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Setup Go for use with actions
+      uses: actions/setup-go@v1.0.0
+      with:
+        version: 1.13
+    - name: Install goimports
+      run: go get golang.org/x/tools/cmd/goimports
+    - name: Run goimports check
+      run: test -z "`for d in $GO_USR_DIRS; do goimports -d $d/*.go | tee /dev/stderr; done`"
+      env:
+        GO_USR_DIRS: $(go list -f {{.Dir}} ./... | grep -E -v "/gen-go/|/vendor/")
+    - name: Create aurora/mesos docker cluster
+      run: docker-compose up -d
+    - name: Run tests
+      run: go test -race -coverprofile=coverage.txt -covermode=atomic -v github.com/aurora-scheduler/gorealis/v2
+