Adds build Github action (#3)

Adds simple build Github Action

.github/workflows/ci.yml

@@ -0,0 +1,22 @@
+name: CI
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Set up Go
+      uses: actions/setup-go@v2
+      with:
+        go-version: 1.17
+
+    - name: Build
+      run: make

README.md

@@ -1,4 +1,4 @@
-# Katbox
+# Katbox ![CI](https://github.com/paypal/katbox/actions/workflows/ci.yml/badge.svg)
 
 Katbox is an inline ephemeral volume manager with delayed deletion for Kubernetes.
 
@@ -40,4 +40,4 @@ A closer look at how the creation and deletion of volumes works can be found [he
 
 # Credits
 This project was initially a fork of
-[CSI Hostpath driver](https://github.com/kubernetes-csi/csi-driver-host-path).
+[CSI Hostpath driver](https://github.com/kubernetes-csi/csi-driver-host-path).