little try 2

.forgejo/workflows/generate-release-zipfile.yml

@@ -21,13 +21,22 @@ jobs:
           echo ratata >> 'tutu tutu*.txt'
           ls -R
 
+      - name: little test
+        run: printf "url: %s\nThe end." "${{ github.server_url }}/${{ github.repository }}@${{ github.env.RELEVANT_SHA }}"
+        env:
+          # from https://github.com/orgs/community/discussions/26325#discussioncomment-5397362
+          RELEVANT_SHA: ${{ github.event.pull_request.head.sha || github.sha }}
+
       - name: Testing the artifact uploading
         id: "uploading"
-        uses: "${{ github.server_url }}/${{ github.repository }}@${{ github.sha }}"
+        uses: "${{ github.server_url }}/${{ github.repository }}@${{ github.env.RELEVANT_SHA }}"
         with:
           path: |
             toto
             tutu*
+        env:
+          # from https://github.com/orgs/community/discussions/26325#discussioncomment-5397362
+          RELEVANT_SHA: ${{ github.event.pull_request.head.sha || github.sha }}
 
       - name: Is there any output for the previous step ?
         run: |