feat: add marimo-python chart

[PACordonnier]

Description of the change

The PR aims to add Marimo as python env exclusively. It is a subset of PR #312.

I've made a more readable commit history. A commit having the change from vscode-python to marimo-python exists (67643b7) and is meant to highlight the changes made from vscode to marimo.

(Following text is copied from #312)

Changes:

• in Chart.yaml
  • change name, description and other metadatas, set version to 0.0.1
• README.md
  • delete its content, to be created by CI
• values.schema.yaml
  • set the image name from inseefrlab/vscode-(xxx) to pacordonnier/marimo-(xxx)
• values.yaml
  • set image version
  • set networking.service.port to 2718 (default marimo port)
• templates folder:

Marimo does not support reading token/password from ENV, so needs to mount the secret-token as volumes

In statefulset.yaml, args are now:

{{- if .Values.git.asCodeServerRoot }}
args: ["{{ .Values.init.standardInitPath }} marimo edit --host 0.0.0.0 --token-password-file ~/.token/PASSWORD /home/{{ .Values.environment.user }}/work/$(basename $GIT_REPOSITORY) .git"]
{{- else }}
args: ["{{ .Values.init.standardInitPath }} marimo edit --host 0.0.0.0 --token-password-file ~/.token/PASSWORD /home/{{ .Values.environment.user }}/work"]
{{- end }}

volume for secret token needs to be declared in statefulset.yaml

spec.template.spec.volumes:
        - name: token
          secret:
            secretName: {{ include "library-chart.secretNameToken" . }}

volumeMounts:

spec.template.spec.containers[0].volumesMounts
- name: token  
  mountPath: /home/{{ .Values.environment.user }}/.token
   readOnly: true

Checklist

• Chart version bumped in Chart.yaml
• Title of the pull request follows this pattern [name_of_the_chart] Descriptive title