Remove unnecessary envOverride (#766)

Our DockerHub password is in ESC, and a bunch of the other variables
were copy-pasted defaults. We need to keep GCP because that isn't in
ESC yet.

Refs https://github.com/pulumi/ci-mgmt/issues/1583.

.github/workflows/weekly-pulumi-update.yml

@@ -8,19 +8,12 @@ on:
 env:
   GITHUB_TOKEN: ${{ secrets.PULUMI_BOT_TOKEN }}
   PROVIDER: docker-build
-  PULUMI_LOCAL_NUGET: ${{ github.workspace }}/nuget
   TRAVIS_OS_NAME: linux
-  PULUMI_GO_DEP_ROOT: ${{ github.workspace }}/..
   GOVERSION: "1.21.x"
   NODEVERSION: "20.x"
   PYTHONVERSION: "3.11.8"
   DOTNETVERSION: "8.0.x"
   JAVAVERSION: "11"
-  ARM_CLIENT_ID: 30e520fa-12b4-4e21-b473-9426c5ac2e1e
-  ARM_SUBSCRIPTION_ID: 0282681f-7a9e-424b-80b2-96babd57a8a1
-  ARM_TENANT_ID: 706143bc-e1d4-4593-aee2-c9dc60ab9be7
-  AWS_REGION: us-west-2
-  AZURE_LOCATION: westus
   GOOGLE_CI_SERVICE_ACCOUNT_EMAIL: pulumi-ci@pulumi-ci-gcp-provider.iam.gserviceaccount.com
   GOOGLE_CI_WORKLOAD_IDENTITY_POOL: pulumi-ci
   GOOGLE_CI_WORKLOAD_IDENTITY_PROVIDER: pulumi-ci
@@ -29,7 +22,10 @@ env:
   GOOGLE_REGION: us-central1
   GOOGLE_ZONE: us-central1-a
   PULUMI_API: https://api.pulumi-staging.io
+  PULUMI_GO_DEP_ROOT: ${{ github.workspace }}/..
+  PULUMI_LOCAL_NUGET: ${{ github.workspace }}/nuget
   PULUMI_PULUMI_ENABLE_JOURNALING: "true"
+  TF_APPEND_USER_AGENT: pulumi
 
 jobs:
   weekly-pulumi-update: