build: add syntax parser directive to Dockerfile
#1186
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buchdag
approved these changes
Mar 10, 2025
buchdag
changed the title
syntax parser directive to Dockerfilesyntax parser directive to Dockerfile
buchdag
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What?
Add
syntaxparser directive to the first line of the Dockerfile.Why?
To declare the Dockerfile syntax version to use for the build.
If unspecified, BuildKit uses a bundled version of the Dockerfile frontend.
How?
Append
# syntax=docker.io/docker/dockerfile:1to the top of the Dockerfile.