Merge ~ubuntu-docker-images/ubuntu-docker-images/+git/postgresql:12-20.04-fix-gosu-drop into ~ubuntu-docker-images/ubuntu-docker-images/+git/postgresql:12-20.04

[Athos Ribeiro]

Revert "Drop gosu"

    This reverts commit 13be7b289627c12f5751e9840015103c502cc69a.

    We need gosu because the entrypoint script uses it in order to restart
    the service.

[Athos Ribeiro (athos-ribeiro)]

I pushed a new change to remove the whole block restarting the script.

[Athos Ribeiro (athos-ribeiro)]

After checking the commit logs for the other series, I realized installing gosu was re-introduced due to this very specific error this patch tries to fix.

Let's re-introduce gosu here for consistency instead.

[Paride Legovini (paride)]

LGTM, thanks!

review: Approve

[Sergio Durigan Junior (sergiodj)]

Thank you, Athos. gosu has been fixed in Focal, so this LGTM.

review: Approve

diff --git a/Dockerfile b/Dockerfile
index 29dbfa6..c576d7b 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -13,6 +13,12 @@ RUN set -eux; \
 	mkdir -p /var/lib/postgresql; \
 	chown -R postgres:postgres /var/lib/postgresql
 
+RUN set -eux; \
+	apt-get update; \
+	DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends gosu; \
+	rm -rf /var/lib/apt/lists/*; \
+	gosu nobody true
+
 # make the "en_US.UTF-8" locale so postgres will be utf-8 enabled by default
 RUN set -eux; \
 	if [ -f /etc/dpkg/dpkg.cfg.d/docker ]; then \