Simplify up/download

Signed-off-by: Christian König <ckoenig@posteo.de>

.github/workflows/build-and-publish.yml

@@ -23,22 +23,15 @@ jobs:
           - registry: dockerhub
             platform: linux/riscv64
             alpine_version: edge
-            platform_dir: linux-riscv64
           - registry: ghcr
             platform: linux/riscv64
             alpine_version: edge
-            platform_dir: linux-riscv64
-          - platform: linux/amd64
-            platform_dir: linux-amd64
-          - platform: linux/386
-            platform_dir: linux-386
-          - platform: linux/arm/v6
-            platform_dir: linux-arm-v6
-          - platform: linux/arm/v7
-            platform_dir: linux-arm-v7
-          - platform: linux/arm64
-            platform_dir: linux-arm64
     steps:
+      - name: Prepare name for digest up/download
+        run: |
+          platform=${{ matrix.platform }}
+          echo "PLATFORM_PAIR=${platform//\//-}" >> $GITHUB_ENV
+
       - name: Checkout Repo
         uses: actions/checkout@v4
 
@@ -91,7 +84,7 @@ jobs:
       - name: Upload digest
         uses: actions/upload-artifact@v4
         with:
-          name: ${{ matrix.platform_dir}}
+          name: digests-${{ matrix.platform}}
           path: /tmp/digests/*
           if-no-files-found: error
           retention-days: 1
@@ -113,15 +106,11 @@ jobs:
 
       - name: Download digests
         uses: actions/download-artifact@v4
-        id: download
         with:
-          path: /tmp/download
+          path: /tmp/digests
+          pattern: digests-*
+          merge-multiple: true
       
-      - name: Copy all artifacts from sub-directories to /tmp/digests
-        run: |
-          mkdir /tmp/digests
-          cp ${{steps.download.outputs.download-path}}/**/* /tmp/digests
-
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3