Merge ~athos-ribeiro/ubuntu-docker-images/+git/cortex:1.7-21.04-deb-manifest into ~ubuntu-docker-images/ubuntu-docker-images/+git/cortex:1.7-21.04

[Athos Ribeiro]

Generate manifest to report installed deb packages

* https://bugs.launchpad.net/ubuntu-docker-images/+bug/1953697

[Sergio Durigan Junior (sergiodj)]

The changes LGTM, but we're not going to be publishing/updating 21.04 images anymore. Ubuntu Hirsute (21.04) will reach EOL on January 20, 2022.

I don't mind if you want to push this to the official git repo just to make sure we're consistent throughout the releases, though.

FWIW, this comment also applies to the other MPs targetting 21.04.

review: Approve

diff --git a/oci/Dockerfile.ubuntu b/oci/Dockerfile.ubuntu
index 237d6f9..e4e0372 100644
--- a/oci/Dockerfile.ubuntu
+++ b/oci/Dockerfile.ubuntu
@@ -51,7 +51,9 @@ RUN set -eux; \
 	DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends \
 		tzdata ca-certificates; \
 	rm -rf /var/lib/apt/lists/*; \
-	mkdir -p /usr/share/rocks
+	mkdir -p /usr/share/rocks; \
+# create deb manifest
+	(echo "# os-release" && cat /etc/os-release && echo "# dpkg-query" && dpkg-query -f '${db:Status-Abbrev},${binary:Package},${Version},${source:Package},${Source:Version}\n' -W) > /usr/share/rocks/dpkg.query
 
 COPY --from=builder /src/cortex/manifest-upstream.txt /usr/share/rocks/upstream