docker stretch ca-certificates letsencrypt

Dockerfile

# Update stretch repositories
RUN sed -i -e 's/deb.debian.org/archive.debian.org/g' \
           -e 's|security.debian.org|archive.debian.org|g' \
           -e '/stretch-updates/d' /etc/apt/sources.list

# LetsEncrypt DST Root CA X3 expired on 2021-09-30
# https://letsencrypt.org/docs/dst-root-ca-x3-expiration-september-2021/
RUN sed -i '/^mozilla\/DST_Root_CA_X3.crt$/ s/^/!/' /etc/ca-certificates.conf
RUN update-ca-certificates