github actions: split artifacts per architecture (#7549)

.github/workflows/packages.yml

@@ -137,8 +137,9 @@ jobs:
     - name: Store *.deb files
       uses: actions/upload-artifact@v2
       with:
-        name: termux-packages-${{ github.sha }}
+        name: termux-packages-${{ matrix.target_arch }}-${{ github.sha }}
         path: ./artifacts
+
   upload:
     if: github.event_name != 'pull_request'
     needs: build
@@ -149,7 +150,6 @@ jobs:
     - name: Get *.deb files
       uses: actions/download-artifact@v2
       with:
-        name: termux-packages-${{ github.sha }}
         path: ./
     - name: Upload to packages.termux.org
       env: