fix: use local Go toolchain

[dunglas]

Companion PR to #1545

[AlliBalliBaba]

Is go mod graph | awk '{if ($1 !~ "@") print $2}' | xargs go get just there for build performance or also to ensure fresh library versions?

[dunglas]

Just for build performance.

[AlliBalliBaba]

I think it would also be fine to just remove that line and let go.mod handle the dependencies, I started a new pipeline in #1545 to compare how much slower it makes the builds.

[AlliBalliBaba]

Seems to not make much difference, maybe even a bit slower with the manual go get ..., hard to accurately compare though

without go get	with go get
3:35	3:35
3:28	4:00
4:28	4:53
3:33	4:56

[robsontenorio]

@dunglas the build docker image pipeline has failed.