Fix Dockerfile

Dockerfile

@@ -1,11 +1,12 @@
 FROM python:3.8-alpine
 
-RUN apk add ffmpeg \
-    && python3 -m pip install -r requirements.txt
-
 WORKDIR /data
 COPY . /data
 
+RUN apk add .build-deps gcc libc-dev \
+    apk add ffmpeg \
+    && python3 -m pip install -r requirements.txt
+
 ENV PREFIX /data
 ENV TOKEN /data
 ENV REDDIT_CLIENT_ID /data