Enable caching for Swift setup (#1053)

Author: speednoisemovement

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

@@ -330,6 +330,7 @@ runs:
       if: inputs.swift-version != '' && inputs.swift-repo == ''
       uses: compnerd/gha-setup-swift@main
       with:
+        cache: 'true'
         source: 'swift.org'
         swift-version: ${{ steps.sanitize-input.outputs.swift-branch }}
         swift-build: ${{ steps.sanitize-input.outputs.swift-tag }}
@@ -338,6 +339,7 @@ runs:
       if: inputs.swift-version != '' && inputs.swift-repo != ''
       uses: compnerd/gha-setup-swift@main
       with:
+        cache: 'true'
         source: 'custom'
         github-repo: ${{ inputs.swift-repo }}
         github-token: ${{ github.token }}