Pin docker/dockerfile:1.6.0 with multi-platform sha256 #4766
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Pull Request check list
Affected functionality
Docker build on platforms other than linux/amd64
Description of change
Set docker/dockerfile:1.6.0 sha256 to the multi-platform manifest instead of referencing the linux/amd64 version.
Cf. "crane digest docker/dockerfile:1.6.0" vs "crane digest --platform linux/amd64 docker/dockerfile:1.6.0"
Which issue this PR fixes
#4765