These commands add Tini to a Docker image - https://github.com/krallin/tini

Dockerfile

# Set TINI_ARCH to one of:
#   ''
#   amd64
#   arm64
#   armhf
#   i386
#   static
#   static-amd64
#   static-arm64
#   static-armhf
#   static-i386
RUN \
  TINI_VERSION=v0.14.0 && \
  TINI_ARCH=amd64 && \
  gpg --keyserver ha.pool.sks-keyservers.net --recv-keys 0x595E85A6B1B4779EA4DAAEC70B588DFF0527A9B7 && \
  curl -fsSLo /sbin/tini "https://github.com/krallin/tini/releases/download/${TINI_VERSION}/tini${TINI_ARCH:+-$TINI_ARCH}" && \
  curl -fsSL "https://github.com/krallin/tini/releases/download/${TINI_VERSION}/tini${TINI_ARCH:+-$TINI_ARCH}.asc" | \
    gpg --verify - /sbin/tini && \
  chmod +x /sbin/tini

ENTRYPOINT [ "/sbin/tini", "--" ]