Enable contextcheck and intrange linters

Author: sevein

.golangci.yml

@@ -10,6 +10,8 @@ linters:
     - unparam
     - gosec
     - tparallel
+    - contextcheck
+    - intrange
 
 issues:
   exclude-dirs:

internal/bundler/metadata.go

@@ -76,7 +76,7 @@ func (m *MetadataSet) Write() error {
 	// Build a list of fields
 	fields := []string{}
 	for field, o := range occurrences {
-		for i := 0; i < o; i++ {
+		for range o {
 			fields = append(fields, field)
 		}
 	}

internal/package_/goa.go

@@ -252,7 +252,7 @@ func (w *goaWrapper) Reject(ctx context.Context, payload *goapackage.RejectPaylo
 	signal := ReviewPerformedSignal{
 		Accepted: false,
 	}
-	err = w.tc.SignalWorkflow(context.Background(), *goapkg.WorkflowID, "", ReviewPerformedSignalName, signal)
+	err = w.tc.SignalWorkflow(ctx, *goapkg.WorkflowID, "", ReviewPerformedSignalName, signal)
 	if err != nil {
 		return goapackage.MakeNotAvailable(errors.New("cannot perform operation"))
 	}

internal/storage/download.go

@@ -1,7 +1,6 @@
 package storage
 
 import (
-	"context"
 	"fmt"
 	"io"
 	"net/http"
@@ -35,7 +34,7 @@ func Download(svc Service, mux goahttp.Muxer, dec func(r *http.Request) goahttp.
 		}
 
 		// Read storage package.
-		ctx := context.Background()
+		ctx := req.Context()
 		pkg, err := svc.ReadPackage(ctx, aipID)
 		if err != nil {
 			rw.WriteHeader(http.StatusNotFound)