add --config flag, an alternative to ZARF_CONFIG env var

[waveywaves]

Description

add --config flag, an alternative to ZARF_CONFIG env var

Related Issue

Fixes #2178

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Other (security config, docs update, etc)

Checklist before merging

• Test, docs, adr added or updated as needed
• Contributor Guide Steps followed

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[AustinAbro321]

Hey @waveywaves sorry for the delay but I would like to get this merged in at some point, I think it's pretty close. Could you merge main into this branch? There are a lot of conflicts but they're all from the new docs site so merging in main and running make docs-and-schema should fix it.

Also could you add the following line to the appropriate block in src/cmd/internal.go

addHiddenDummyFlag(toolCmd, "config-path")