Check `arch` for podman build — radicle-explorer

Usually going with Darwin -> aarch64 and the rest fallback to amd64 isn’t a bad choice, but I think we can do better by checking arch so a device like a Raspberry which has an ARM CPU is able to run the build script.

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   export SOURCE_DATE_EPOCH=$(git log -1 --pretty=%ct)
   # Define user OS for podman
   export OS=$(uname)
   # Define architecture for podman
   export ARCH=$(arch)
   if ! command -v rad >/dev/null; then
     echo "fatal: rad is not installed" >&2

       --build-arg LC_ALL \
       --build-arg RADICLE_VERSION=$version \
       --build-arg GIT_HEAD=$rev \
       --arch aarch64 --tag $image -f ./build/Dockerfile - <$gitarchive
       --arch $ARCH --tag $image -f ./build/Dockerfile - <$gitarchive
     echo "Creating container (radicle-build-container).."
     podman create --ulimit=host --replace --name radicle-build-container $image

       --build-arg TZ \
       --build-arg LC_ALL \
       --build-arg RADICLE_VERSION=$version \
       --arch amd64 --tag $image -f ./build/Dockerfile - <$gitarchive
       --arch $ARCH --tag $image -f ./build/Dockerfile - <$gitarchive
     echo "Creating container (radicle-build-container).."
     podman --cgroup-manager=cgroupfs create --ulimit=host --replace --name radicle-build-container $image