devcontainer: add cmake and cmake extensions [skip ci]

.devcontainer/Dockerfile

@@ -3,7 +3,7 @@ FROM mcr.microsoft.com/devcontainers/base:bookworm
 RUN apt-get update && \
   export DEBIAN_FRONTEND=noninteractive && \
   apt-get -y install --no-install-recommends \
-    apt-utils dialog clang-format clang pbuilder
+    apt-utils dialog clang-format clang pbuilder cmake
 
 # bookworm packaging
 RUN mkdir -p /usr/local/src/pkg

.devcontainer/devcontainer.json

@@ -28,7 +28,9 @@
         "ms-vscode.cpptools-extension-pack",
         "GitHub.vscode-github-actions",
         "eamodio.gitlens",
-        "xaver.clang-format"
+        "xaver.clang-format",
+        "cheshirekow.cmake-format",
+        "brobeson.vscode-cmake-lint"
       ]
     }
   },