Alpine Does Not Support B64 Decode Long Flag

[tgoodsell-tempus]

In the latest version of Alpine, it does not support the base64 --decode option:

➜ docker run --rm -it alpine:latest /bin/sh
/ # base64 --help
BusyBox v1.35.0 (2022-11-19 10:13:10 UTC) multi-call binary.

Usage: base64 [-d] [-w COL] [FILE]

Base64 encode or decode FILE to standard output

	-d	Decode data
	-w COL	Wrap lines at COL (default 76, 0 disables)

Therefore, using the additional_private_registries option crashes the alpine image. Since ubuntu support both -d and --decode, using d should fix this.

[tgoodsell-tempus]

#352 Is the fix for this.

[mstandley-tempus]

To help others find this issue, here is the console output associated with this problem:

base64: unrecognized option: decode