Fix host replace in Dockerfile

docker/Dockerfile

@@ -23,7 +23,7 @@ COPY ./assets/ ./assets/
 COPY ./config/config.yml ./config/config.yml
 COPY ./config/sql/ ./config/sql/
 COPY ./locales/ ./locales/
-RUN sed -i 's/host: localhost/host: postgres/' config/config.yml
+RUN sed -i 's/host: 127.0.0.1/host: postgres/' config/config.yml
 COPY --from=builder /invidious/invidious .
 USER invidious
 CMD [ "/invidious/invidious" ]