Working on updating tooling.

Author: sean-parent

.ruby-version

@@ -1 +1 @@
-2.7.3
+2.7.4

tools/docker-tools/Dockerfile

@@ -1,5 +1,5 @@
 # Build from the latest ubuntu release
-FROM ubuntu:latest AS base
+FROM ubuntu:focal AS base
 
 # Install items requiring root access
 

tools/docker-tools/README.md

@@ -76,11 +76,11 @@ To build the Docker image, first, update the VERSION variable below (please use
 
 #### Linux, WSL 2, MacOS
 ```
-VERSION="1.0.18"
+VERSION="1.0.19"
 VOLUME="docker.pkg.github.com/sean-parent/notebook/notebook-tools:latest"
 
 # The ruby version should match what GitHub Pages requires: https://pages.github.com/versions/
-RUBY_VERSION=2.7.3
+RUBY_VERSION=2.7.4
 
 echo $RUBY_VERSION > ./.ruby-version
 echo $VERSION > ./tools/docker-tools/VERSION

tools/docker-tools/VERSION

@@ -1 +1 @@
-1.0.18
+1.0.19