create dummy cache

.github/workflows/test.yaml

@@ -189,10 +189,43 @@ jobs:
       - run: pip list
       - run: pytest ${{ matrix.test-directory }} ${{ matrix.pytest-args }} -n auto --dist=loadscope
         working-directory: ${{ matrix.package }}
+  dummy_cache:
+    needs: [ crds-contexts ]
+    runs-on: ubuntu-latest
+    env:
+      CRDS_TEST_ROOT: /tmp
+      CRDS_PATH: /tmp/crds-cache-default-test
+      CRDS_TESTING_CACHE: /tmp/crds-cache-test
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          repository: spacetelescope/crds
+      - run: pip install git+https://github.com/spacetelescope/jwst roman-datamodels
+      - run: pip uninstall --yes crds && ./install && pip install .
+      - run: |
+          python -m crds.sync --all --stats --log-time --check-sha1sum --repair-files --organize=flat
+          python -m crds.sync --files l2d0959cj_pfl.fits n7p1032ao_apt.fits q5417413o_pct.fits xaf1429el_wcp.fits y2r1559to_apt.fits y2r16006o_pct.fits y951738kl_hv.fits yas2005el_hv.fits p7d1548qj_idc.fits 3241637sm_tmt.fits 41g16069m_tmg.fits 43h1909cm_tmc.fits 43h1240om_tmc.fits --stats --log-time
+          python -m crds.sync --contexts hst_cos.imap --fetch-references --log-time --stats
+        env:
+          CRDS_SERVER_URL: https://hst-crds.stsci.edu
+          CRDS_CONTEXT: hst_1194.pmap
+      - run: |
+          python -m crds.sync --all --stats --log-time --check-sha1sum --repair-files --organize=flat
+          python -m crds.sync --files jwst_niriss_flat_0000.fits jwst_miri_flat_0006.fits --stats --log-time
+        env:
+          CRDS_SERVER_URL: https://jwst-crds.stsci.edu
+          CRDS_CONTEXT: jwst_1298.pmap
+      - uses: actions/cache/save@v4
+        with:
+          path: |
+            ${{ env.CRDS_PATH }}
+            ${{ env.CRDS_TESTING_CACHE }}
+          key: test-cache-hst_1194.pmap-jwst_1298.pmap
   crds_test_cache:
+    name: retrieve CRDS test cache
     # uses: spacetelescope/crds/.github/workflows/cache.yml@79766e965b9053632fb82d0c86c1d6988b5b934b  # 12.0.6
     uses: zacharyburnett/crds/.github/workflows/cache.yml@ci/update_partial_cache
-  test_crds_with_data:
+  test_crds:
     needs: [ build, crds_test_cache ]
     strategy:
       fail-fast: false