add syntax directive

Author: vbvictor

.github/workflows/containers/github-action-ci-tooling/Dockerfile

@@ -1,18 +1,17 @@
+# syntax=docker/dockerfile:1.7
 ARG LLVM_VERSION=21.1.0
-ARG LLVM_VERSION_MAJOR=21
 
 FROM docker.io/library/ubuntu:24.04 AS llvm-downloader
 ARG LLVM_VERSION
-ARG LLVM_VERSION_MAJOR
 
 RUN apt-get update && \
     apt-get install -y wget xz-utils && \
     wget -O llvm.tar.xz https://github.com/llvm/llvm-project/releases/download/llvmorg-${LLVM_VERSION}/LLVM-${LLVM_VERSION}-Linux-X64.tar.xz && \
     mkdir -p /llvm-extract && \
     tar -xvJf llvm.tar.xz -C /llvm-extract \
         # Only unpack these tools to save space on Github runner.
-        LLVM-${LLVM_VERSION}-Linux-X64/bin/clang-${LLVM_VERSION_MAJOR} \
-        LLVM-${LLVM_VERSION}-Linux-X64/lib/clang/${LLVM_VERSION_MAJOR}/include \
+        LLVM-${LLVM_VERSION}-Linux-X64/bin/clang-${LLVM_VERSION%%.*} \
+        LLVM-${LLVM_VERSION}-Linux-X64/lib/clang/${LLVM_VERSION%%.*}/include \
         LLVM-${LLVM_VERSION}-Linux-X64/bin/clang-tidy \
         LLVM-${LLVM_VERSION}-Linux-X64/bin/clang-format \
         LLVM-${LLVM_VERSION}-Linux-X64/bin/git-clang-format && \
@@ -54,16 +53,15 @@ RUN pip install -r requirements_formatting.txt --break-system-packages && \
 
 FROM base AS ci-container-code-lint
 ARG LLVM_VERSION
-ARG LLVM_VERSION_MAJOR
 
 COPY --from=llvm-downloader /llvm-extract/LLVM-${LLVM_VERSION}-Linux-X64/bin/clang-tidy \
-                            /llvm-extract/LLVM-${LLVM_VERSION}-Linux-X64/bin/clang-${LLVM_VERSION_MAJOR} \
+                            /llvm-extract/LLVM-${LLVM_VERSION}-Linux-X64/bin/clang-${LLVM_VERSION%%.*} \
                             ${LLVM_SYSROOT}/bin/
-COPY --from=llvm-downloader /llvm-extract/LLVM-${LLVM_VERSION}-Linux-X64/lib/clang/${LLVM_VERSION_MAJOR}/include \
-                            ${LLVM_SYSROOT}/lib/clang/${LLVM_VERSION_MAJOR}/include
+COPY --from=llvm-downloader /llvm-extract/LLVM-${LLVM_VERSION}-Linux-X64/lib/clang/${LLVM_VERSION%%.*}/include \
+                            ${LLVM_SYSROOT}/lib/clang/${LLVM_VERSION%%.*}/include
 COPY clang-tools-extra/clang-tidy/tool/clang-tidy-diff.py ${LLVM_SYSROOT}/bin/clang-tidy-diff.py
 
-RUN ln -s ${LLVM_SYSROOT}/bin/clang-${LLVM_VERSION_MAJOR} ${LLVM_SYSROOT}/bin/clang && \
+RUN ln -s ${LLVM_SYSROOT}/bin/clang-${LLVM_VERSION%%.*} ${LLVM_SYSROOT}/bin/clang && \
     ln -s ${LLVM_SYSROOT}/bin/clang ${LLVM_SYSROOT}/bin/clang++
 
 ENV PATH=${LLVM_SYSROOT}/bin:${PATH}