arm64/qemu build

• Build arm64v8 version of eic-container to be used on ARM systems (such as the arm-based MacOS systems, or raspberry pi systems).

containers/debian/base.Dockerfile

@@ -17,8 +17,8 @@ ENV CLICOLOR_FORCE=1                                                    \
 
 ## Install additional packages. Remove the auto-cleanup functionality
 ## for docker, as we're using the new buildkit cache instead.
-RUN --mount=type=cache,target=/var/cache/apt                            \
-    --mount=type=cache,target=/var/lib/apt/lists                        \
+RUN --mount=type=cache,target=/var/cache/apt,sharing=locked             \
+    --mount=type=cache,target=/var/lib/apt/lists,sharing=locked         \
     rm -f /etc/apt/apt.conf.d/docker-clean                              \
  && ln -fs /usr/share/zoneinfo/America/New_York /etc/localtime          \
  && echo "US/Eastern" > /etc/timezone                                   \
@@ -60,8 +60,8 @@ RUN --mount=type=cache,target=/var/cache/apt                            \
 # Install updated compilers, with support for multiple base images
 ## Ubuntu: latest gcc from toolchain ppa, latest stable clang
 ## Debian: default gcc with distribution, latest stable clang
-RUN --mount=type=cache,target=/var/cache/apt                            \
-    --mount=type=cache,target=/var/lib/apt/lists                        \
+RUN --mount=type=cache,target=/var/cache/apt,sharing=locked             \
+    --mount=type=cache,target=/var/lib/apt/lists,sharing=locked         \
     . /etc/os-release                                                   \
  && mkdir -p /etc/apt/source.list.d                                     \
  && if [ "${ID}" = "ubuntu" ] ; then                                    \