Modify Dockerfile to use alpine image #158
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Problem
The current Docker image Node v10 is built upon an unmaintained Debian distribution, which can cause security issues.
Closes #155.
Solution
Modify Dockerfile to use alpine image. Node version has also been upgraded to 12.
So far, not experiencing any compatibility issues based on testing the core features of GoGovSG. Will test with release checklist tomorrow on staging to confirm it's 100% working.