licensing: fix setup for creating license keys locally and for testing features in a local instance (#41150)

Fix function to generate license key; add env var to the repo-updater

enterprise/internal/license/generate-license.go

@@ -68,7 +68,7 @@ func main() {
 	if err != nil {
 		log.Fatal(err)
 	}
-	licenseKey, err := license.GenerateSignedKey(info, privateKey)
+	licenseKey, _, err := license.GenerateSignedKey(info, privateKey)
 	if err != nil {
 		log.Fatal(err)
 	}

sg.config.yaml

@@ -249,7 +249,9 @@ commands:
       - cmd/repo-updater
 
   repo-updater:
-    cmd: .bin/repo-updater
+    cmd: |
+      export SOURCEGRAPH_LICENSE_GENERATION_KEY=$(cat ../dev-private/enterprise/dev/test-license-generation-key.pem)
+      .bin/repo-updater
     install: |
       if [ -n "$DELVE" ]; then
         export GCFLAGS='all=-N -l'