update Dockerfile to use multi-stage build #79
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Before
![courier-before](https://user-images.githubusercontent.com/75167930/139136346-17f75c45-6a87-4ba5-a06e-edc35c2e77eb.png)
After
![courier-after](https://user-images.githubusercontent.com/75167930/139136380-364450a3-5218-4ceb-903c-bbb36c1f772c.png)