doc: workaround fix for deploying external-dns

[zxkane]

make bitnami/external-dns working with IRSA

closes #1289

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[M00nF1sh]

/ok-to-test

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[kishorj]

@zxkane Thanks for your PR. Could you port it to the main branch so that ti can be included in the v2 releases?

[sudo6si]

@zxkane I would strongly urge you to update the example with securityContext: { fsGroup: 65534 } as is recommended by the upstream

[zxkane]

@zxkane Thanks for your PR. Could you port it to the main branch so that ti can be included in the v2 releases?

Will try it.

[codecov-io]

Codecov Report

Merging #1290 (56ad207) into main (fbbeffc) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1290   +/-   ##
=======================================
  Coverage   46.11%   46.11%           
=======================================
  Files         110      110           
  Lines        5920     5920           
=======================================
  Hits         2730     2730           
  Misses       2926     2926           
  Partials      264      264           

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[zxkane]

@kishorj let me know if you have any comment for this pr for main branch.

[M00nF1sh]

/lgtm
thanks for fixing this :D looks good to me.

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