go_sdk.host() leads to unstable unreproducible builds

[vorburger]

Expected Behavior

Builds just always just work.

Actual Behavior

Builds regularly break unexpectedly, whenever the version of Go on the host changes; see #626.

Required solution

Replace the go_sdk.host() here with a "fixed version of a remote go toolchain".

[vorburger]

#715 fixed this problem locally for this project.

bazel-contrib/rules_go#3967 raised for an "upstream" discussion about this problem (with bazel-contrib/rules_go#3968).