fix(gatsby-source-drupal): use basic auth credentials to fetch remote…

… files as well. (gatsbyjs#10302)

* gatsby-source-drupal: use basic auth credentials also when fetching remote files.

* gatsby-source-drupal: better support the case where no basic auth is specified.

packages/gatsby-source-drupal/src/gatsby-node.js

@@ -194,12 +194,21 @@ exports.sourceNodes = async (
           }
           // Resolve w/ baseUrl if node.uri isn't absolute.
           const url = new URL(fileUrl, baseUrl)
+          // If we have basicAuth credentials, add them to the request.
+          const auth =
+            typeof basicAuth === `object`
+              ? {
+                  htaccess_user: basicAuth.username,
+                  htaccess_pass: basicAuth.password,
+                }
+              : {}
           fileNode = await createRemoteFileNode({
             url: url.href,
             store,
             cache,
             createNode,
             createNodeId,
+            auth,
           })
         } catch (e) {
           // Ignore