Auto merge of #62757 - pietroalbini:fix-linuxtools, r=alexcrichton
Auto merge of #62757 - pietroalbini:fix-linuxtools, r=alexcrichton

ci: fix LinuxTools PR builder missing environment variables

This PR includes the new `public-credentials` variables group in PR builders, hopefully fixing sccache and toolstate.

~~Do not merge this yet as I want to do a test build first.~~

r? @alexcrichton
fixes https://github.com/rust-lang/rust/issues/62754 https://github.com/rust-lang/rust/issues/62753

aidancully/rust,graydon/rust,graydon/rust,aidancully/rust,aidancully/rust,graydon/rust,graydon/rust,aidancully/rust,graydon/rust,aidancully/rust,aidancully/rust,graydon/rust