remove unused download-cache workflow

.github/workflows/download-cache.yml

@@ -1,40 +0,0 @@
-name: archive download sources weekly
-
-on:
-  workflow_dispatch:
-  schedule:
-    - cron: "* 14 * * 5"
-
-env:
-  GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-
-jobs:
-  download:
-    name: cache download sources
-    runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        php-version: [ "8.0", "8.1", "8.2", "8.3" ]
-    steps:
-      - uses: actions/checkout@v3
-
-      # Cache composer dependencies
-      - id: cache-composer-deps
-        uses: actions/cache@v3
-        with:
-          path: vendor
-          key: composer-dependencies
-
-      # If there's no Composer cache, install dependencies
-      - if: steps.cache-composer-deps.outputs.cache-hit != 'true'
-        run: composer update --no-dev
-
-      # If there's no dependencies cache, fetch sources, with or without debug
-      - if: steps.cache-download.outputs.cache-hit != 'true'
-        run: ./bin/spc download --with-php=${{ matrix.php-version }} --all --debug
-
-      # Upload downloaded files
-      - uses: actions/upload-artifact@v3
-        with:
-          name: download-files-${{ matrix.php-version }}
-          path: downloads/