Golangci lint fixes (#195)

* Add golangci-lin as make target
* Fix: could omit type ... from declaration; it will be inferred from the right-hand side (staticcheck)
* Fix func intArrayContains is unused (unused)
* Fix: could use strings.ReplaceAll instead (staticcheck)
* Fix: could expand call to math.Pow (staticcheck)
* Fix: could use tagged switch on `...` (staticcheck)
* Fix: Error return value of `...` is not checked (errcheck)
* Fix: ineffectual assignment to err (ineffassign)
* Fix: There is no need to wait for command completion
* Add cpustat, diskstat and schedstat config
* Use slices to exclude metrics
* Replaced stringArrayContains by slices.Contains
* Replace m[k]=v loop with maps.Copy
* Use module slices from the standard library. Remove use of golang.org/x/exp/slices
* Use SplitSeq and max to modernize code

collectors/slurmCgroupMetric.go

@@ -50,8 +50,7 @@ func ParseCPUs(cpuset string) ([]int, error) {
 		return result, nil
 	}
 
-	ranges := strings.Split(cpuset, ",")
-	for _, r := range ranges {
+	for r := range strings.SplitSeq(cpuset, ",") {
 		if strings.Contains(r, "-") {
 			parts := strings.Split(r, "-")
 			if len(parts) != 2 {
@@ -103,7 +102,9 @@ func (m *SlurmCgroupCollector) readFile(path string) ([]byte, error) {
 func (m *SlurmCgroupCollector) Init(config json.RawMessage) error {
 	var err error
 	m.name = "SlurmCgroupCollector"
-	m.setup()
+	if err := m.setup(); err != nil {
+		return fmt.Errorf("%s Init(): setup() call failed: %w", m.name, err)
+	}
 	m.parallel = true
 	m.meta = map[string]string{"source": m.name, "group": "SLURM"}
 	m.tags = map[string]string{"type": "hwthread"}