allow skipping validation

[lczyk]

ci runs in chisel releases need to install slices multiple times. every install runs on the same repo and is forced to run validation. this currently takes about 60% of the CI time. it woudl be an incredibly useful feature to allow us to skip validation in certain contexts. i've been running chisel quite successfully only for local dev-time testing with the following:

diff --git i/internal/setup/setup.go w/internal/setup/setup.go
index 4502687..1909f8e 100644
--- i/internal/setup/setup.go
+++ w/internal/setup/setup.go
@@ -187,6 +187,12 @@ func ReadRelease(dir string) (*Release, error) {
 		return nil, err
 	}
 
+	// skip validation for cached releases is CHISEL_HACKS flag is set
+	if os.Getenv("CHISEL_HACKS") != "" {
+		logf("Skipping release validation due to CHISEL_HACKS")
+		return release, nil
+	}
+
 	err = release.validate()
 	if err != nil {
 		return nil, err

(i don't propose this exact code to be merged)

• ci: improve execution times for install-slices chisel-releases#580 (comment)

[letFunny]

Related to #254. In Chisel we never want to skip validation of the release, that will create more problems down the line. Think about working on a local version of Chisel cut and turning it off, then turning it back on only to see validation errors and think instead is better to just leave it off. It could happen just by copying code with the wrong flags from the CI. We would get many error reports and we would need to differentiate between the two leading to more frustrated users.

I do agree that it takes a long time at the moment, especially when running it on the CI. It is also true that validation is the single most important operation that we perform. While I do not think it is a good idea to disable it, I do think we could cache the result or speed it up.