Actions: use a secondary cache bucket for mixed versions tests.

To hopefully reduce the amount of write limiting seen in ci.

Author: kjnilsson

.github/workflows/templates/test-mixed-versions.template.yaml

@@ -106,9 +106,9 @@ jobs:
       if: env.exists != 'true'
       working-directory: secondary-umbrella
       run: |
-        if [ -n "${{ secrets.REMOTE_CACHE_BUCKET_NAME }}" ]; then
+        if [ -n "${{ secrets.REMOTE_CACHE_BUCKET_NAME_MIXED }}" ]; then
         cat << EOF >> user.bazelrc
-          build --remote_cache=https://storage.googleapis.com/${{ secrets.REMOTE_CACHE_BUCKET_NAME }}
+          build --remote_cache=https://storage.googleapis.com/${{ secrets.REMOTE_CACHE_BUCKET_NAME_MIXED }}
           build --google_default_credentials
 
           build --remote_download_toplevel

.github/workflows/test-mixed-versions.yaml

@@ -84,9 +84,9 @@ jobs:
       if: env.exists != 'true'
       working-directory: secondary-umbrella
       run: |
-        if [ -n "${{ secrets.REMOTE_CACHE_BUCKET_NAME }}" ]; then
+        if [ -n "${{ secrets.REMOTE_CACHE_BUCKET_NAME_MIXED }}" ]; then
         cat << EOF >> user.bazelrc
-          build --remote_cache=https://storage.googleapis.com/${{ secrets.REMOTE_CACHE_BUCKET_NAME }}
+          build --remote_cache=https://storage.googleapis.com/${{ secrets.REMOTE_CACHE_BUCKET_NAME_MIXED }}
           build --google_default_credentials
 
           build --remote_download_toplevel