https://hub.docker.com/r/termux/termux-docker/tags

Currently all the images are labelled as linux/amd64. I think they should be properly fixed so that supposedly they can run on their own native architectures without any Docker warnings.

1. Though I am not quite settled for:
   arm to use linux/arm or linux/arm/v7 or linux/arm32v7?
   aarch64 to use linux/aarch64 or linux/arm/v8 or linux/arm64 or linux/arm64v8?
   i686 (which is also "latest") to change to linux/i386?

2. We also need to look into adding busybox that are native to their arches
   The one at https://github.com/termux/termux-docker/blob/4c08c24bceb13cecd1d18153dfddbbf5fe70bb71/system/arm/bin/busybox is currently 32bit arm static binary (checksum cd04052b8b6885f75f50b2a280bfcbf849d8710c8e61d369c533acf307eda064) which based on https://github.com/hazy/google-distroless/blob/master/WORKSPACE#L423 is coming from https://busybox.net/downloads/binaries/1.31.0-defconfig-multiarch-musl/