Use jammy as base image

Dockerfile

@@ -1,4 +1,4 @@
-FROM ubuntu:focal
+FROM ubuntu:jammy
 
 ENV LANG=C.UTF-8 \
     LC_ALL=C.UTF-8 \

README.md

@@ -25,7 +25,7 @@ A container image with useful tools to automate deployments.
 - [htpasswd](https://httpd.apache.org/docs/current/programs/htpasswd.html)
 - [unison](https://github.com/bcpierce00/unison)
 
-It is based on Ubuntu 20.04, but don't rely on it and if you do, be
+It is based on Ubuntu 22.04, but don't rely on it and if you do, be
 extra sure to pin a tag.
 
 It starts as user 0.

install/get-salt

@@ -1,7 +1,7 @@
 #!/usr/bin/env bash
 set -ex
-curl -fsSL -o /usr/share/keyrings/salt-archive-keyring.gpg https://repo.saltproject.io/py3/ubuntu/20.04/amd64/latest/salt-archive-keyring.gpg
-echo "deb [signed-by=/usr/share/keyrings/salt-archive-keyring.gpg] https://repo.saltproject.io/py3/ubuntu/20.04/amd64/latest focal main" | tee /etc/apt/sources.list.d/salt.list
+curl -fsSL -o /etc/apt/keyrings/salt-archive-keyring-2023.gpg https://repo.saltproject.io/salt/py3/ubuntu/22.04/amd64/SALT-PROJECT-GPG-PUBKEY-2023.gpg
+echo "deb [signed-by=/etc/apt/keyrings/salt-archive-keyring-2023.gpg arch=amd64] https://repo.saltproject.io/salt/py3/ubuntu/22.04/amd64/latest jammy main" | tee /etc/apt/sources.list.d/salt.list
 apt-get update -y
 apt-get install -y salt-ssh
 rm -fr /var/lib/apt/lists/*