[build] github actions ci job (Snowflake-Labs#270)

Add a CI job run by github actions. Codecov integration is dropped for
now, we will see if we miss it.

Also upgrade to go 1.15 and remove travis-ci build.

## Test Plan
* [x] acceptance tests

## References
<!-- issues documentation links, etc  -->

*

.github/workflows/ci.yml

@@ -0,0 +1,28 @@
+on: push
+
+jobs:
+  run:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        target:
+          - check-docs
+          - check-mod
+          - lint-ci
+          - test-acceptance-ci
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-go@v2
+        with:
+          go-version: '1.15.2'
+      - name: Install dependencies
+        run: make setup
+
+      - name: make ${{ matrix.target }}
+        env:
+          REVIEWDOG_GITHUB_API_TOKEN: ${{ secrets.REVIEWDOG_GITHUB_API_TOKEN }}
+          SNOWFLAKE_USER: ${{ secrets.SNOWFLAKE_USER }}
+          SNOWFLAKE_PASSWORD: ${{ secrets.SNOWFLAKE_PASSWORD }}
+          SNOWFLAKE_ACCOUNT: ${{ secrets.SNOWFLAKE_ACCOUNT }}
+          SNOWFLAKE_ROLE: ${{ secrets.SNOWFLAKE_ROLE }}
+        run: make ${{ matrix.target }}

go.mod

@@ -1,6 +1,6 @@
 module github.com/chanzuckerberg/terraform-provider-snowflake
 
-go 1.13
+go 1.15
 
 require (
 	cloud.google.com/go/pubsub v1.0.1 // indirect