bug#44382: Updating the guix package triggers a full Git clone of guix.git

[Leo Famulari]

While building the package of Guix itself [0], I noticed that Savannah
can't serve cheap "shallow clones" of the commits that these packages
are based on, so users will end up doing full clones (260M on
disk):

------
building 
/gnu/store/ma04vkl42jyr9p2nw5yzlzw61r5s2h3p-guix-1.1.0-31.1c6d985-checkout.drv...
guile: warning: failed to install locale
environment variable `PATH' set to 
`/gnu/store/378zjf2kgajcfd7mfr98jn5xyc5wa3qv-gzip-1.10/bin:/gnu/store/sf3rbvb6iqcphgm1afbplcs72hsywg25-tar-1.32/bin'
Initialized empty Git repository in 
/gnu/store/nwf2579gigc9xhnd7i82lpmja854l9fb-guix-1.1.0-31.1c6d985-checkout/.git/
error: Server does not allow request for unadvertised object 
1c6d98533153bc8e0e36236e7fbcf1eb5e178d26
Failed to do a shallow fetch; retrying a full fetch...
------

I'm reaching out to the Savannah admins to ask them about this, and if
it has any unduly negative affects on the Savannah infrastructure.

Maybe these commits should be tagged?

[0]
That is, while building (@@ (gnu packages package-management) guix)