fix(gh-cache/save): Make destination directory(s) before copying files there

Author: smockle

.github/actions/gh-cache/save/action.yml

@@ -64,6 +64,7 @@ runs:
       shell: bash
       run: |
         if [ -f "${{ inputs.path }}" ]; then
+          mkdir -p ".gh-cache-${{ github.run_id }}/$(dirname "${{ inputs.path }}")"
           cp -Rf "${{ inputs.path }}" ".gh-cache-${{ github.run_id }}/${{ inputs.path }}"
           echo "Copied '${{ inputs.path }}' to 'gh-cache' branch"
         fi