separate out CompatCheck

Author: lkdvos

.github/workflows/CI.yml

@@ -123,28 +123,3 @@ jobs:
         run: |
           echo "Compat check result: ${{ needs.compatcheck.result }}"
         continue-on-error: true
-
-  compatcheck:
-    name: "Compat (${{ matrix.group }}, Julia ${{ matrix.julia-version }})"
-    needs: [setup-matrix, test]
-    if: github.event.pull_request.draft != true
-    runs-on: ubuntu-latest
-    strategy:
-      fail-fast: false
-      matrix:
-        downgrade_mode: ['deps']
-        group: ${{ fromJSON(needs.setup-matrix.outputs.groups) }}
-        julia-version: ['1', '1.10']
-    steps:
-      - uses: actions/checkout@v6
-      - uses: julia-actions/setup-julia@v2
-        with:
-          version: ${{ matrix.julia-version }}
-      - uses: julia-actions/cache@v3
-      - uses: julia-actions/julia-downgrade-compat@v2
-        with:
-          mode: ${{ matrix.downgrade_mode }}
-          skip: Random, LinearAlgebra, Test, Combinatorics
-          julia_version: ${{ matrix.julia-version }}
-      - uses: julia-actions/julia-buildpkg@v1
-      - uses: julia-actions/julia-runtest@v1

.github/workflows/CompatCheck.yml

@@ -0,0 +1,70 @@
+name: CompatCheck
+
+on:
+  push:
+    branches:
+      - 'main'
+      - 'release-'
+
+    tags: '*'
+
+    paths:
+      - 'Project.toml'
+      - 'test/Project.toml'
+
+  pull_request:
+    types: [opened, synchronize, reopened, ready_for_review, converted_to_draft]
+  workflow_dispatch:
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  # Cancel intermediate builds: only if it is a pull request build.
+  cancel-in-progress: ${{ startsWith(github.ref, 'refs/pull/') }}
+
+jobs:
+  setup-matrix:
+    runs-on: ubuntu-latest
+    outputs:
+      groups: ${{ steps.mk.outputs.groups }}
+      version: ${{ steps.mk.outputs.version }}
+      os: ${{ steps.mk.outputs.os }}
+    steps:
+      - uses: actions/checkout@v6
+      - id: mk
+        shell: bash
+        run: |
+          # Auto-discover test groups from all subdirectory names.
+          groups=$(find test -mindepth 1 -maxdepth 1 -type d \
+            | xargs -I{} basename {} | sort \
+            | jq -R -s -c '[split("\n")[] | select(length > 0)]')
+
+          echo "groups=${groups}" >> "$GITHUB_OUTPUT"
+          fi
+  compatcheck:
+    name: "Compat (${{ matrix.group }}, Julia ${{ matrix.julia-version }})"
+    needs: [setup-matrix, test]
+    if: github.event.pull_request.draft != true
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        downgrade_mode: ['deps']
+        group: ${{ fromJSON(needs.setup-matrix.outputs.groups) }}
+        julia-version: ['1', '1.10']
+    steps:
+      - uses: actions/checkout@v6
+      - uses: julia-actions/setup-julia@v2
+        with:
+          version: ${{ matrix.julia-version }}
+      - uses: julia-actions/cache@v3
+      - uses: julia-actions/julia-downgrade-compat@v2
+        with:
+          mode: ${{ matrix.downgrade_mode }}
+          skip: Random, LinearAlgebra, Test, Combinatorics
+          julia_version: ${{ matrix.julia-version }}
+      - uses: julia-actions/julia-buildpkg@v1
+      - uses: julia-actions/julia-runtest@v1
+        with:
+          test_args: '${{ matrix.group }} --fast'
+        env:
+          JULIA_NUM_THREADS: "4"