Add support for dockerfile lint and fix flagged issues

.devcontainer/Dockerfile

@@ -4,14 +4,16 @@
 FROM ubuntu:22.04
 
 # Install gcc, clang and some supporting tools for downloading/installing later tools.
-RUN apt-get update && apt-get install -y wget g++ lcov llvm git gpg ninja-build software-properties-common unzip
+RUN apt-get update && apt-get install -y --no-install-recommends wget g++ lcov llvm git gpg ninja-build software-properties-common unzip && rm -rf /var/lib/apt/lists/*
 
 # Install newer CMake from kitware.
 RUN wget -O - https://apt.kitware.com/keys/kitware-archive-latest.asc 2>/dev/null | gpg --dearmor - | tee /etc/apt/trusted.gpg.d/kitware.gpg >/dev/null \
-&& apt-add-repository -y 'deb https://apt.kitware.com/ubuntu/ jammy main' && apt-get update && apt-get install -y cmake
+&& apt-add-repository -y 'deb https://apt.kitware.com/ubuntu/ jammy main' && apt-get update && apt-get install -y --no-install-recommends cmake && rm -rf /var/lib/apt/lists/*
 
 # Install bazel.
 RUN wget https://github.com/bazelbuild/bazel/releases/download/6.4.0/bazel-6.4.0-installer-linux-x86_64.sh \
 && bash bazel-6.4.0-installer-linux-x86_64.sh && rm bazel-6.4.0-installer-linux-x86_64.sh
 
+RUN rm -rf /var/lib/apt/list/*
+
 ENV PATH="/usr/local/bin:$PATH"

.pre-commit-config.yaml

@@ -32,3 +32,8 @@ repos:
     hooks:
     -   id: clang-format
         types_or: [c++, c]
+- repo: https://github.com/pryorda/dockerfilelint-precommit-hooks
+  rev: v0.1.0
+  hooks:
+  - id: dockerfilelint
+    stages: [commit]