Adds automated CI tests on pull requests and master

Adds github actions automated testing to pull requests and master
pushes.

.github/workflows/main.yml

@@ -0,0 +1,28 @@
+name: CI
+
+# Controls when the workflow will run
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  test:
+    # The type of runner that the job will run on
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3.0.1
+      with:
+        fetch-depth: 0
+    - name: Cache bazel
+      uses: actions/cache@v3.0.2
+      env:
+        cache-name: bazel-cache
+      with:
+        path: |
+          ~/.cache/bazel
+        key: ${{ runner.os }}-${{ env.cache-name }}
+
+    - name: Bazel test
+      run: bazel test //...

README.md

@@ -1,5 +1,7 @@
 # Turbo Cache
 
+[![CI](https://github.com/allada/turbo-cache/actions/workflows/main.yml/badge.svg)](https://github.com/allada/turbo-cache/actions/workflows/main.yml)
+
 An extremely fast and efficient bazel cache service (CAS) written in rust.
 
 The goals of this project are: