ci(distrolist.yml): create only one branch per change

.github/workflows/distrolist.yml

@@ -82,7 +82,12 @@ jobs:
           fi
           echo "distlist_title=${title}" >> $GITHUB_ENV
           echo "distlist_body=Automatically generated by CI" >> $GITHUB_ENV
-          echo "dl_date=$(date +'%Y-%m-%d/%H_%M_%S')" >> $GITHUB_ENV
+          echo "dl_hash=$(echo -n "${title}" | sha256sum | cut -c1-8)" >> $GITHUB_ENV
+          if git ls-remote --heads origin | grep "update-distrolist-${dl_hash}"; then
+            echo "No changes to distrolist."
+            echo "changes_detected=false" >> $GITHUB_ENV
+            exit 0
+          fi
 
       - name: Create PR if changes detected
         if: env.changes_detected == 'true'
@@ -91,6 +96,6 @@ jobs:
           token: ${{ secrets.GITHUB_TOKEN }}
           add-paths: distrolist
           base: master
-          branch: update-distrolist-${{ env.dl_date }}
+          branch: update-distrolist-${{ env.dl_hash }}
           title: ${{ env.distlist_title }}
           body: ${{ env.distlist_body }}