Update CI.yml

Author: ChrisRackauckas

.github/workflows/CI.yml

@@ -1,46 +1,36 @@
-name: CI
+name: Downgrade
 on:
+  pull_request:
+    branches:
+      - master
+    paths-ignore:
+      - 'docs/**'
   push:
     branches:
-      - main
-    tags: ['*']
-  pull_request:
-concurrency:
-  # Skip intermediate builds: always.
-  # Cancel intermediate builds: only if it is a pull request build.
-  group: ${{ github.workflow }}-${{ github.ref }}
-  cancel-in-progress: ${{ startsWith(github.ref, 'refs/pull/') }}
+      - master
+    paths-ignore:
+      - 'docs/**'
 jobs:
   test:
-    name: Julia ${{ matrix.version }} - ${{ matrix.os }} - ${{ matrix.arch }} - ${{ github.event_name }}
-    runs-on: ${{ matrix.os }}
+    runs-on: ubuntu-latest
     strategy:
-      fail-fast: false
       matrix:
-        version:
-          - 'lts'
-          - '1'
-          - 'pre'
-        os:
-          - ubuntu-latest
-        arch:
-          - x64
+        group:
+          - Core
+        downgrade_mode: ['alldeps']
+        julia-version: ['1.10']
     steps:
       - uses: actions/checkout@v4
       - uses: julia-actions/setup-julia@v2
         with:
-          version: ${{ matrix.version }}
-          arch: ${{ matrix.arch }}
-      - uses: julia-actions/julia-downgrade-compat@v1
-        if: ${{ matrix.version == '1.6' }}
+          version: ${{ matrix.julia-version }}
+      - uses: julia-actions/julia-downgrade-compat@v2
+#        if: ${{ matrix.version == '1.6' }}
         with:
-          skip: Pkg, TOML
-      - uses: julia-actions/cache@v2
+          skip: Pkg,TOML
       - uses: julia-actions/julia-buildpkg@v1
       - uses: julia-actions/julia-runtest@v1
-      - uses: julia-actions/julia-processcoverage@v1
-      - uses: codecov/codecov-action@v5
         with:
-          files: lcov.info
-          token: ${{ secrets.CODECOV_TOKEN }}
-          fail_ci_if_error: false
+          ALLOW_RERESOLVE: false
+        env:
+          GROUP: ${{ matrix.group }}