CI: remove unneeded worker tag

- move tag value to YAML anchor

Author: aramprice

ci/pipeline.yml

@@ -1,4 +1,7 @@
 ---
+vars:
+  - &worker_tag_windows windows-nimbus
+
 jobs:
   - name: bump-deps
     public: true
@@ -12,7 +15,6 @@ jobs:
       - task: bump-deps
         file: golang-release/ci/tasks/shared/bump-deps.yml
         image: golang-release-image
-        tags: [ windows-nimbus ]
         params:
           GIT_USER_NAME: CI Bot
           GIT_USER_EMAIL: cf-bosh-eng@pivotal.io
@@ -28,7 +30,6 @@ jobs:
       - task: bump-deps-test-acceptance-release
         file: golang-release/ci/tasks/shared/bump-deps.yml
         image: golang-release-image
-        tags: [ windows-nimbus ]
         params:
           GIT_USER_NAME: CI Bot
           GIT_USER_EMAIL: cf-bosh-eng@pivotal.io
@@ -44,7 +45,6 @@ jobs:
       - task: bump-deps-debug
         file: golang-release/ci/tasks/shared/bump-deps.yml
         image: golang-release-image
-        tags: [ windows-nimbus ]
         params:
           GIT_USER_NAME: CI Bot
           GIT_USER_EMAIL: cf-bosh-eng@pivotal.io
@@ -145,7 +145,7 @@ jobs:
       - task: test-unit-windows
         timeout: 1h
         file: bosh-dns-release/ci/tasks/windows/test-unit-windows.yml
-        tags: [ windows-nimbus ]
+        tags: [*worker_tag_windows]
         params:
           BOSH_DNS_RECURSOR_ADDRESS: 192.19.189.10