Add github actions + Linting (#27)

* Add github actions
* Linting

.github/workflows/docker.yml

@@ -0,0 +1,20 @@
+name: Docker
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
+
+jobs:
+
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Build the Docker image
+      run: docker build --no-cache . --file Dockerfile --tag mikenye/picard:testing