When using GCS for the techdocs storage and not setting the GOOGLE_APPLICATION_CREDENTIALS environment variable, authentication and accessing the bucket fails due to the project ID not being found.

Relevant log output

```
techdocs error from GCS client library: Unable to detect a Project Id in the current environment.
```

By adding the projectID when initializing the Storage client, this should fix the issue. This current approach expects the project_id to be in the json credentials, which it usually is.

Another option would be to re-add the app-config projectID value back and allow users to specify the projectID that way as well.

Signed-off-by: Jeremy Guarini <jguarini@paloaltonetworks.com>

packages/techdocs-common/src/stages/publish/googleStorage.ts

@@ -82,7 +82,7 @@ export class GoogleGCSPublish implements PublisherBase {
     const credentials = config.getOptionalString(
       'techdocs.publisher.googleGcs.credentials',
     );
-    let credentialsJson = {};
+    let credentialsJson: any = {};
     if (credentials) {
       try {
         credentialsJson = JSON.parse(credentials);
@@ -95,6 +95,7 @@ export class GoogleGCSPublish implements PublisherBase {
 
     const storageClient = new Storage({
       ...(credentials && {
+        projectId: credentialsJson.project_id,
         credentials: credentialsJson,
       }),
     });