Update (ci): github action's artifact upgrade v4

.github/actions/job-dump/action.yml

@@ -31,7 +31,7 @@ runs:
       shell: bash
 
     - name: Upload pytest test results
-      uses: actions/upload-artifact@v2
+      uses: actions/upload-artifact@v4
       with:
         name: ${{ inputs.artifact-name }}
         path: meta.json

.github/workflows/ci_compatible.yml

@@ -42,13 +42,6 @@ jobs:
           echo $pr_runtimes
           echo "runtimes={include: $pr_runtimes}" >> $GITHUB_OUTPUT
 
-      - run: echo "[]" > projects.json
-      - name: Upload placeholder
-        uses: actions/upload-artifact@v3
-        with:
-          name: compatibility-${{ github.sha }}
-          path: projects.json
-
   pytester:
     needs: generator
     runs-on: ${{ matrix.os }}
@@ -70,25 +63,16 @@ jobs:
         if: always()
         uses: ./.github/actions/job-dump
         with:
-          artifact-name: project-${{ github.sha }}-${{ strategy.job-index }}
+          artifact-name: project-${{ github.sha }}-${{ strategy.job-index }}-pytester
 
   collector:
     runs-on: ubuntu-latest
     needs: [generator, pytester]
     if: always()
     strategy:
-      max-parallel: 1 # run sequential to prevent download/upload collisions
       matrix: ${{ fromJSON(needs.generator.outputs.matrix) }}
     steps:
-      - name: Download 📥 summary
-        uses: actions/download-artifact@v3
-        with:
-          name: compatibility-${{ github.sha }}
-      - name: Download 📥 project
-        uses: actions/download-artifact@v3
-        with:
-          name: project-${{ github.sha }}-${{ strategy.job-index }}
-
+      - run: echo "[]" > projects.json
       - run: ls -l
       - name: append result
         run: |
@@ -101,8 +85,14 @@ jobs:
             json.dump(data, fp)
         shell: python
 
+      - name: Upload 📥 project
+        uses: actions/upload-artifact@v4
+        with:
+          name: project-${{ github.sha }}-${{ strategy.job-index }}-collector
+          path: project-${{ github.sha }}-*
+
       - name: Upload pytest test results
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: compatibility-${{ github.sha }}
           path: projects.json
@@ -129,7 +119,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - name: Download 📥 summary
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: compatibility-${{ github.sha }}
       - run: cat projects.json
@@ -170,7 +160,7 @@ jobs:
           git config user.email [email protected]
           git merge origin/main
       - name: Download 📥 summary
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: compatibility-${{ github.sha }}
       - name: Update results
@@ -182,3 +172,14 @@ jobs:
       - name: Kick
         if: contains(fromJSON('["schedule", "workflow_dispatch"]'), github.event_name)
         run: git push
+
+  merge-artifacts:
+    needs: archiver
+    runs-on: ubuntu-latest
+    steps:
+      - name: Download 📥
+        uses: actions/upload-artifact/merge@v4
+        with:
+          name: project-${{ github.sha }}-${{ strategy.job-index }}
+          pattern: project-${{ github.sha }}-*
+          delete-merged: true