Merge pull request 'Use slim node image instead of alpine' (#288) from austinhuang.me/teddit:austinhuang.me-patch-1 into main

Reviewed-on: https://codeberg.org/teddit/teddit/pulls/288

Dockerfile

@@ -1,8 +1,8 @@
-# Use LTS Node.js base image
-FROM node:14.17-alpine
+# Use LTS Node.js slim image
+FROM node:14.17-slim
 
 # Video support dependency
-RUN apk add ffmpeg
+RUN apt update && apt install -y ffmpeg
 
 # Install NPM dependencies and copy the project
 WORKDIR /teddit