add `syntax` parser directive to Dockerfile (#8055)

As recommended by https://docs.docker.com/build/concepts/dockerfile/#dockerfile-syntax
2025-03-12 09:09:11 +09:00 · 2025-03-12 09:09:11 +09:00 · adf1d06d64
parent 077c3c5db1
commit adf1d06d64
2 changed files with 2 additions and 0 deletions
--- a/test/boulder-tools/Dockerfile
+++ b/test/boulder-tools/Dockerfile
@ -1,3 +1,4 @@
+# syntax=docker/dockerfile:1
 FROM buildpack-deps:focal-scm as godeps
 ARG GO_VERSION
 # Provided automatically by docker build.
--- a/test/ct-test-srv/Dockerfile
+++ b/test/ct-test-srv/Dockerfile
@ -1,3 +1,4 @@
+# syntax=docker/dockerfile:1
 ARG GO_VERSION

 FROM golang:${GO_VERSION} AS build