download only correct images in merge steps

Author: CamJN

.github/workflows/main.yml

@@ -319,7 +319,7 @@ jobs:
         uses: actions/download-artifact@v4
         with:
           path: /tmp/digests
-          pattern: digests-ubuntu-*
+          pattern: digests-ubuntu-${{ matrix.distro }}-*
           merge-multiple: true
 
       - name: Docker meta
@@ -375,7 +375,7 @@ jobs:
         uses: actions/download-artifact@v4
         with:
           path: /tmp/digests
-          pattern: digests-debian-*
+          pattern: digests-debian-${{ matrix.distro }}-*
           merge-multiple: true
 
       - name: Docker meta