fix: correctly set PIP_NO_BINARY

[dariuszd21]

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[mr-cal]

Interesting, I guess :all was silently being ignored by pip?

Looks like the build time has gone from 5 minutes to 20 minutes.

[dariuszd21]

Interesting, I guess :all was silently being ignored by pip?

Looks like the build time has gone from 5 minutes to 20 minutes.

I think it was treated as a package name 😅.
Currently the problem is that underlying build is a single-core, and that's why it takes so long to create a package from sources.
And maybe this could fix the RISC-V built 🤔

[mr-cal]

This should start passing once canonical/craft-store#221 is pulled in.

[mr-cal]

Closing because this was cherry-picked in #5084. Thanks!