Added Clang 21, removed clang 18

Author: madduci

.github/workflows/build.yaml

@@ -17,7 +17,7 @@ jobs:
     # steps to perform in job
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       # setup Docker buld action
       - name: Set up Docker Buildx
@@ -38,7 +38,7 @@ jobs:
           # Note: tags has to be all lower-case
           tags: |
             madduci/docker-linux-cpp:latest
-            madduci/docker-linux-cpp:2.1
+            madduci/docker-linux-cpp:2.2
           # build on feature branches, push only on master branch
           push: ${{ github.ref == 'refs/heads/master' }}
 

Dockerfile

@@ -1,12 +1,12 @@
 FROM ubuntu:24.04
 
-LABEL maintainer="Michele Adduci <[email protected]>" \
+LABEL maintainer="Michele Adduci <[email protected]>" \
       license="MIT"
 
 WORKDIR /project
 
 ARG DEB_COMPILERS="g++-12 g++-13 g++-14"
-ARG EXTRA_CLANG_COMPILERS="18 19 20"
+ARG EXTRA_CLANG_COMPILERS="19 20 21"
 
 RUN echo "Installing required packages " \
          && export DEBIAN_FRONTEND=noninteractive  \