Add MR template so we don't forget to change a chart's version number

The template should contain these steps:

  • Manually tested chart changes with the openappstack bootstrap script
  • Created an MR in openappstack/openappstack that applies the changes from this MR
  • Tests in that MR in openappstack/openappstack succeed
  • Updated chart version number
Edited by Maarten de Waard
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