chore(ci): fix deploy-code CI job

In #17060, the `deploy-code` job was updated to [include][1] the
`init_environment` step. This step assumes that the working directory is
`~/ng`. The `deploy-code` job uses the `cloud-sdk`, which
[did not specify a working directory][2]. As a result, the
`init_environment` step and subsequently the `deploy-code` job failed.
Examples failures: [on master][3], [on v1.8.x][4]

This commit fixes the issue by specifying a working directory for the
`cloud-sdk` executor. It also updates paths used in other steps of the
`deploy-code` job to take the working directory into account.

[1]: https://github.com/angular/angular.js/blob/83f084e5db95768dcee5302fa77924e1fb1f3239/.circleci/config.yml#L359
[2]: https://github.com/angular/angular.js/blob/83f084e5db95768dcee5302fa77924e1fb1f3239/.circleci/config.yml#L34-L37
[3]: https://app.circleci.com/pipelines/github/angular/angular.js/152/workflows/812df7b2-4bba-4e9e-a868-8c58db5d40d1/jobs/1594
[4]: https://app.circleci.com/pipelines/github/angular/angular.js/153/workflows/6a9826ac-d191-4042-8c39-0c969c81e381/jobs/1607

Author: gkalpak

.circleci/config.yml

@@ -35,6 +35,7 @@ executors:
     description: The docker container to use when running gcp-gcs commands
     docker:
       - image: google/cloud-sdk:alpine@sha256:7d0cae28cb282b76f2d9babe278c63c910d54f0cceca7a65fdf6806e2b43882e
+    working_directory: ~/ng
 
 
 # Filter Definitions
@@ -358,7 +359,7 @@ jobs:
       - custom_attach_workspace
       - init_environment
       - skip_unless_tag_or_master_or_stable_branch
-      - run: ls ~/ng/deploy/code
+      - run: ls deploy/code
       - run:
           name: Authenticate and configure Docker
           command: |
@@ -367,7 +368,7 @@ jobs:
       - run:
           name: Sync files to code.angularjs.org
           command: |
-            gsutil -m rsync -r ~/ng/deploy/code gs://code-angularjs-org-338b8.appspot.com
+            gsutil -m rsync -r deploy/code gs://code-angularjs-org-338b8.appspot.com
 
   # The `deploy-docs` job should only run when all of these conditions are true for the build:
   # - It is for the `angular/angular.js` repository (not a fork).