Update chartpress to 2.0

- require chartpress 2 in dev-requirements
- set baseVersion in chartpress.yaml
- note baseVersion bump in release process

Author: minrk

RELEASE.md

@@ -93,6 +93,8 @@ Also the images we build are based on some image specified in the `FROM` stateme
     git push --follow-tags <upstream> main
     ```
 
+  - [ ] Update baseVersion in chartpress to the next release (e.g. `2.1.0-0.dev` after 2.0.0)
+
   - [ ] Create a GitHub release.
         Visit the [release page](https://github.com/jupyterhub/zero-to-jupyterhub-k8s/releases) and create a new release referencing the recent tag. Add a brief text like the one below.
 

chartpress.yaml

@@ -13,6 +13,7 @@ charts:
     # Dev: imagePrefix can be useful to override if you want to trial something
     #      locally developed in a remote k8s cluster.
     imagePrefix: jupyterhub/k8s-
+    baseVersion: "2.0.0-0.dev"
     repo:
       git: jupyterhub/helm-chart
       published: https://jupyterhub.github.io/helm-chart

dev-requirements.txt

@@ -5,7 +5,7 @@
 #
 # ref: https://github.com/jupyterhub/chartpress
 #
-chartpress>=1.1.0
+chartpress==2.*
 
 # pytest run tests that require requests and pyyaml
 pytest>=3.7.1