Reduce archive-full-index branch size by squashing all commits

[jotamartos]

Description of the change

These changes squash all commits in the branch every time the job is executed

Benefits

Repo size is reduced

Possible drawbacks

None AFAIK

Applicable issues

Additional information

Related to https://github.com/bitnami/charts/pull/25712

Checklist

• [Na] Chart version bumped in Chart.yaml according to semver. This is not necessary when the changes only affect README.md files.
• [NA] Variables are documented in the values.yaml and added to the README.md using readme-generator-for-helm
• [NA] Title of the pull request follows this pattern [bitnami/<name_of_the_chart>] Descriptive title
• [X] All commits signed off and in agreement of Developer Certificate of Origin (DCO)