chore: prevent image pollution with log information

Author: rjaegers

.devcontainer/cpp/Dockerfile

@@ -92,7 +92,8 @@ RUN --mount=type=cache,target=/root/.ccache,sharing=locked \
 
 # Update all tool alternatives to the correct version
 # and patch root's bashrc to include bash-completion
-RUN update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-14 10 \
+RUN --mount=type=cache,target=/var/log,sharing=locked \
+ update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-14 10 \
                         --slave /usr/bin/g++ g++ /usr/bin/g++-14 \
                         --slave /usr/bin/gcov gcov /usr/bin/gcov-14 \
  && update-alternatives --install /usr/bin/cc cc /usr/bin/gcc-14 10 \

.devcontainer/rust/Dockerfile

@@ -44,7 +44,8 @@ RUN batstmp="$(mktemp -d /tmp/bats-core-${BATS_VERSION}.XXXX)" \
 
 # Update all tool alternatives to the correct version
 # and patch root's bashrc to include bash-completion
-RUN update-alternatives --install /usr/bin/cc cc /usr/bin/gcc-14 20 \
+RUN --mount=type=cache,target=/var/log,sharing=locked \
+ update-alternatives --install /usr/bin/cc cc /usr/bin/gcc-14 20 \
  && cp /etc/skel/.bashrc /root/.bashrc
 
 # Install additional rust tools