This commit adds a more descriptive docs about the caching process. In
addition, the `github.job` is now removed from the cache key
construction to allow jobs sharing the same cache. In addition, given we
now use `inputs.key-prefix`, the `github.job` is no longer relevant as
the `key-prefix` already creates a unique name for the cache.
We also update the lint and check commits job to use the same cache from
the unit test, given they are running in the same environment.
Turns out that actions/setup-go starting with @v4 also adds caching.
With that, our cache size on disk has almost doubled, leading to the
GitHub runner running out of space in certain situation.
We fix that by disabling the automated caching since we already have our
own, custom-tailored version.
This is a tradeoff of disk space (and with that cache size) and
compilation speed. Because we're still running into disk full errors
with the full build cache, we remove it for the cross compile step.
Which means we'll do more work each time.
To avoid build caches getting larger and larger, causing our builds to
fail, we separate the caches of the different job types.
If we don't separate them, then the caches can end up being a
combination of the different jobs, which isn't useful (for example the
build cache of the cross compilation build isn't useful in an
integration test and vice versa).
To avoid the problem where multiple jobs try to create the same cache
entry, we add the GitHub job ID to the cache key.
The two restore keys make it possible that a job can also restore a
cache entry from another job if none for the current job exist yet.
With this commit we allow the Go version that is set up to be
configurable and not dependent on a specific environment variable. This
will allow us to eventually extract the action into a tooling
repository.
For some reason we used to override the GOCACHE and GOPATH variables
earlier. This now causes the updated cache action not to pick up any
caches. As the overrides shouldn't be needed anymore, we remove them.
