fix: deployment indent

[yurii-kryvosheia]

When using fluxcd, an incorrect indent can cause issues with the Values.args in a helm release.
Helm template:

          args:
          - --db-file
          - /var/lib/mailpit/mailpit.db
          - --webroot
          - /
            - --tag
            - tag=some-tag

becomes

          args:
          - --db-file
          - /var/lib/mailpit/mailpit.db
          - --webroot
          - / - --tag - tag=some-tag

[jouve]

good catch !