Docker updates

.github/ISSUE_TEMPLATE/release-todo.md

@@ -28,7 +28,19 @@ Be sure to remember to do the following for releases.
  - [ ] Set default version on squib.readthedocs.org (Advanced Settings)
  - [ ] Bump version.rb to the next alpha
  - [ ] Publish on BoardGameGeek thread
+ - [ ] Anything else to add to this checklist?
+
+ # Docker
+ - [ ] Check Dockerfile for updates
+ - [ ] `docker build .`
+ - [ ] `docker tag XYZ andymeneely/squib:latest`
+ - [ ] `docker tag XYZ andymeneely/squib:version-0.XYZ.0`
+ - [ ] `docker push andymeneely/squib:latest`
+ - [ ] `docker push andymeneely/squib:version-0.XYZ.0`
  - [ ] Check Docker build on Dockerhub: https://hub.docker.com/repository/docker/andymeneely/squib
  - [ ] Check Docker docker pull: docker pull andymeneely/squib:latest
- - [ ] Check Docker build locally in samples: docker run --rm -v "%cd%":/usr/src/app andymeneely/squib:latest ruby basic
+ - [ ] Check Docker build locally in samples:
+  * Delete `samples/_output/basic_*.png`
+  * `docker run --rm -v c:\code\squib\samples:/usr/src/app -w /usr/src/app andymeneely/squib:latest ruby basic.rb`
+  * Check that the files were made
  - [ ] Anything else to add to this checklist?

Dockerfile

@@ -1,6 +1,6 @@
 # This is the official Squib Docker image.
 #
-FROM ruby:2.7-slim
+FROM ruby:3.0-slim
 WORKDIR /usr/src/app
 
 LABEL org.squib.url=http://squib.rocks \