fix arm64 arch. use copy --chmod. reduce number of layers.

[edgd1er]

{Please select 'base: dev' as target branch above! (you can delete this line)}

Description

• replace chmod in run § with COPY --chmod=0755
• reduce number of layers (each RUN is a layer)
• add temporarily binutils to have readelf as sometimes pihole-FTL is not downloaded (html error). I guess this could be removed when the cause wil be identified.
• arm64 arch could not download as the arch name was wrong as the FTLARCH value
• Moved ARG/ENV to top of file. (easier to find where to search when changing values)

Motivation and Context

• pihole-FTL for arm64 was not downloaded.
• reduce size reducing layers (RUN)

How Has This Been Tested?

run dig commands on pihole on a amd64 (intel i5) and arm64 (Rpi4)

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.

Actually....

[PromoFaux]

Sorry, I should be a stickler here... Can you squash all commits and also sign off per instructions here to keep the bot happy

https://github.com/pi-hole/docker-pi-hole/pull/1393/checks?check_run_id=15273573118

[github-actions]

This pull request has conflicts, please resolve those before we can evaluate the pull request.

[github-actions]

Conflicts have been resolved.

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

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