Add curl as dependency to allow for healthchecks

Closes https://github.com/Chocobozzz/PeerTube/issues/4045.

support/docker/production/Dockerfile.buster

@@ -7,7 +7,7 @@ ARG NPM_RUN_BUILD_OPTS
 
 # Install dependencies
 RUN apt update \
- && apt install -y --no-install-recommends openssl ffmpeg python ca-certificates gnupg gosu build-essential \
+ && apt install -y --no-install-recommends openssl ffmpeg python ca-certificates gnupg gosu build-essential curl \
  && gosu nobody true \
  && rm /var/lib/apt/lists/* -fR