chore: update Dockerfile syntax version to 1.21.0

matrixise · claude · matrixise · commit 81147d9dfbec · 2026-02-03T08:18:02.000+01:00
Update the Docker buildkit syntax version from 1.19.0 to 1.21.0 to benefit
from the latest build features and improvements in the BuildKit engine.

Co-Authored-By: Claude Sonnet 4.5 &lt;noreply@anthropic.com&gt;
diff --git a/Dockerfile b/Dockerfile
@@ -1,4 +1,4 @@
-# syntax=docker/dockerfile:1.19.0
+# syntax=docker/dockerfile:1.21.0
 FROM python:3.13 AS compile-stage
 RUN --mount=type=cache,target=/var/cache/apt \
     apt update && \

Original file line number	Diff line number	Diff line change
`@@ -1,4 +1,4 @@`
`1`		`-# syntax=docker/dockerfile:1.19.0`
	`1`	`+# syntax=docker/dockerfile:1.21.0`
`2`	`2`	`FROM python:3.13 AS compile-stage`
`3`	`3`	`RUN --mount=type=cache,target=/var/cache/apt \`
`4`	`4`	`apt update && \`