Add GitHub Actions CI (#183)

Signed-off-by: jdolitsky <[email protected]>

.github/workflows/build-pr.yml

@@ -0,0 +1,25 @@
+name: build-pr
+
+on:
+  pull_request:
+    branches:
+      - master
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: setup go environment
+        uses: actions/setup-go@v1
+        with:
+          go-version: '1.15.2'
+      - name: run unit tests
+        run: make test
+      - name: upload coverage report
+        uses: actions/upload-artifact@master
+        with:
+          name: oras-coverage-report-${{ github.sha }}
+          path: .cover/
+        if: always()

.github/workflows/build.yml

@@ -0,0 +1,24 @@
+name: build
+
+on:
+  push:
+    branches: master
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: setup go environment
+        uses: actions/setup-go@v1
+        with:
+          go-version: '1.15.2'
+      - name: run unit tests
+        run: make test
+      - name: upload coverage report
+        uses: actions/upload-artifact@master
+        with:
+          name: oras-coverage-report-${{ github.sha }}
+          path: .cover/
+        if: always()

README.md

@@ -1,6 +1,6 @@
 # OCI Registry As Storage
 
-[![Codefresh build status]( https://g.codefresh.io/api/badges/pipeline/orasbot/deislabs%2Foras%2Fmaster?type=cf-1)]( https://g.codefresh.io/public/accounts/orasbot/pipelines/deislabs/oras/master)
+[![GitHub Actions status](https://github.com/deislabs/oras/workflows/build/badge.svg)](https://github.com/deislabs/oras/actions?query=workflow%3Abuild)
 [![Go Report Card](https://goreportcard.com/badge/github.com/deislabs/oras)](https://goreportcard.com/report/github.com/deislabs/oras)
 [![GoDoc](https://godoc.org/github.com/deislabs/oras?status.svg)](https://godoc.org/github.com/deislabs/oras)