fix(build): prevent all styles from being purged

Signed-off-by: SphericalKat <amolele@gmail.com>

Dockerfile

@@ -24,11 +24,10 @@ RUN npm --prefix ./assets ci --progress=false --no-audit --loglevel=error
 
 COPY priv priv
 COPY assets assets
+COPY lib lib
 RUN npm run --prefix ./assets deploy
 RUN mix phx.digest
 
-# compile and build release
-COPY lib lib
 # uncomment COPY if rel/ exists
 # COPY rel rel
 RUN mix do compile, release