Ensure values are written to env not printed

Switch away from Write-Host since it won't put the values in the
environment like we need for subsequent steps.

Author: brianmichel

.github/actions/setup-sccache/action.yml

@@ -43,12 +43,12 @@ runs:
           }
 
           Write-Host "Using S3 bucket ${{ inputs.s3-bucket }} for cache storage."
-          Write-Host SCCACHE_BUCKET=${{ inputs.s3-bucket }} | Out-File -FilePath $env:GITHUB_ENV -Encoding utf8 -Append
-          Write-Host SCCACHE_REGION=${{ inputs.aws-region }} | Out-File -FilePath $env:GITHUB_ENV -Encoding utf8 -Append
-          Write-Host SCCACHE_S3_SERVER_SIDE_ENCRYPTION=${{ inputs.s3-bucket-encryption }} | Out-File -FilePath $env:GITHUB_ENV -Encoding utf8 -Append
+          "SCCACHE_BUCKET=${{ inputs.s3-bucket }}" | Out-File -FilePath $env:GITHUB_ENV -Encoding utf8 -Append
+          "SCCACHE_REGION=${{ inputs.aws-region }}" | Out-File -FilePath $env:GITHUB_ENV -Encoding utf8 -Append
+          "SCCACHE_S3_SERVER_SIDE_ENCRYPTION=${{ inputs.s3-bucket-encryption }}" | Out-File -FilePath $env:GITHUB_ENV -Encoding utf8 -Append
         } else {
           Write-Host "Using local disk cache."
-          Write-Host SCCACHE_DIRECT='on' | Out-File -FilePath $env:GITHUB_ENV -Encoding utf8 -Append
+          "SCCACHE_DIRECT=on" | Out-File -FilePath $env:GITHUB_ENV -Encoding utf8 -Append
         }
 
     - name: Authenticate to AWS