Converto to GitHub actions (#364)

.github/workflows/lint.yml

@@ -0,0 +1,27 @@
+name: 'Linter'
+
+on:
+  pull_request:
+  push:
+    branches: master
+
+jobs:
+  shellcheck:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: shellcheck
+        uses: reviewdog/action-shellcheck@v1
+        with:
+          github_token: ${{ secrets.github_token }}
+          reporter: github-pr-review
+
+  hadolint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: hadolint
+        uses: reviewdog/action-hadolint@v1
+        with:
+          github_token: ${{ secrets.github_token }}
+          reporter: github-pr-review