[DO NOT MERGE] dummy Dockerfile to test linter GHA annotations

Signed-off-by: Mikhail Malyshev <[email protected]>

Author: rucoder

tools/ci/dockerfile_linter/Dockerfile

@@ -0,0 +1,21 @@
+# Test Dockerfile for CI: intentionally contains old-style ENV/ARG syntax
+FROM alpine:3.20
+
+# Old-style ENV with single token (should modernize to ENV HOME=/root)
+ENV HOME /root
+
+# Old-style ENV with spaces and embedded quotes (quotes inside should be escaped)
+ENV TITLE The "best" image
+
+# Old-style ARG with default (should modernize to ARG VERSION=1.2.3)
+ARG VERSION 1.2.3
+
+# Bare ARG (should remain unchanged; no '=' added)
+ARG NO_DEFAULT
+
+# Old-style multi-line ENV with continuations (should collapse and wrap <=100 cols)
+ENV BUILD_PKGS gcc make     musl-dev libcurl-dev     python3-dev
+
+# Already modern lines (should stay unchanged)
+ENV MODERN_A=1 MODERN_B=2
+ARG MODERN_ARG=ok