Replace failing lfs caching with downloading test files from release tarballs

.github/workflows/ci.yml

@@ -26,11 +26,30 @@ jobs:
         python-version: ['3.8', '3.9', '3.10', '3.11']
 
     steps:
-      - name: Cached LFS checkout
-        uses: nschloe/action-cached-lfs-checkout@v1.2.2
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
-          enableCrossOsArchive: true
+          lfs: false
+
+      # Due to limited LFS bandwidth, it is preferable to download
+      # test files from the last release.
+      #
+      # This does mean that testing new LFS files in the CI is tricky;
+      # care should be taken to also test new files locally first
+      # Tests missing these files in the CI should still fail.
+      - name: Download static files from last release for testing
+        uses: robinraju/release-downloader@v1
+        with:
+          latest: true
+          tarBall: false
+          fileName: "galvani-*.gz"
+          zipBall: false
+          out-file-path: /home/runner/work/last-release
+          extract: true
+
+      - name: Copy test files from static downloaded release
+        run: |
+          cp -r /home/runner/work/last-release/*/tests/testdata tests
 
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v5
@@ -50,5 +69,5 @@ jobs:
           tox -vv --notest
 
       - name: Run all tests
-        run: |
+        run: |-
           tox --skip-pkg-install