Reduce container image size (#485)

Co-authored-by: Max Isom <hi@maxisom.me>

CHANGELOG.md

@@ -5,6 +5,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+### Fixed
+- Switched back to an Alpine container base image to reduce size
 
 ## [0.5.0] - 2022-01-21
 ### Changed

Dockerfile

@@ -1,9 +1,9 @@
-FROM node:16.13.0 AS base
+FROM node:16.13.2-alpine AS base
 
 # Install ffmpeg
-RUN apt-get update && \
-    apt-get install -y ffmpeg && \
-    rm -rf /var/lib/apt/lists/*
+RUN apk update && \
+    apk add ffmpeg && \
+    rm -rf /var/cache/apk/* 
 
 WORKDIR /usr/app