split coverage job out to make it easier to depend on just one report

Author: MaximilianAlgehed

.github/workflows/haskell-ci.yml

@@ -37,7 +37,7 @@ jobs:
           restore-keys: ${{ matrix.ghc-version }}-
       - run: cabal build all --ghc-options=-fhpc
       - run: cabal test all --ghc-options=-fhpc
-      - run: hpc report constrained.tix > report.md
+      - run: hpc report constrained.tix > coverage-report.md
       - run: cabal haddock all
       - uses: actions/cache/save@v4
         with:
@@ -48,13 +48,24 @@ jobs:
         uses: actions/upload-artifact@v4
         with:
           name: constrained-${{matrix.ghc-version}}-coverage
-          path: constrained.tix
+          path: coverage-report.md
           if-no-files-found: error
           compression-level: 0
           retention-days: 1
 
+  report:
+
+    depends-on: linux
+
+    if: github.event.pull_request
+
+    steps:
+      - name: Download coverage report
+        uses: actions/download-artifact@v4
+        with:
+          pattern: 'constrained-latest-coverage'
+
       - name: Find Comment
-        if: github.event.pull_request && ${{matrix.ghc-version}} == 'latest'
         uses: peter-evans/find-comment@v3
         id: fc
         with:
@@ -63,10 +74,9 @@ jobs:
           body-includes: "expressions used"
 
       - name: Create or update comment
-        if: github.event.pull_request && ${{matrix.ghc-version}} == 'latest'
         uses: peter-evans/create-or-update-comment@v4
         with:
           comment-id: ${{ steps.fc.outputs.comment-id }}
           issue-number: ${{ github.event.pull_request.number }}
-          body-path: report.md
+          body-path: coverage-report.md
           edit-mode: replace