Simplify artifact download

Signed-off-by: Christian König <[email protected]>

.github/workflows/ftl-build.yml

@@ -29,23 +29,22 @@ jobs:
         include:
           - platform: linux/amd64
             container: alpine:3.18
-            platform_dir: linux-amd64
           - platform: linux/386
             container: alpine:3.18
-            platform_dir: linux-386
           - platform: linux/arm/v6
             container: alpine:3.18
-            platform_dir: linux-arm-v6
           - platform: linux/arm/v7
             container: alpine:3.18
-            platform_dir: linux-arm-v7
           - platform: linux/arm64/v8
             container: alpine:3.18
-            platform_dir: linux-arm-v8
           - platform: linux/riscv64
             container: alpine:edge
-            platform_dir: linux-riscv64
     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
@@ -137,7 +136,7 @@ jobs:
         if: github.event_name != 'pull_request'
         uses: actions/upload-artifact@v4
         with:
-          name: ${{ matrix.platform_dir}}
+          name: digests-${{ env.PLATFORM_PAIR }}
           path: /tmp/digests/*
           if-no-files-found: error
           retention-days: 1
@@ -157,14 +156,11 @@ jobs:
       -
         name: Download digests
         uses: actions/download-artifact@v4
-        id: download
         with:
-          path: /tmp/download
-      - 
-        name: Copy all artifacts from sub-directories to /tmp/digests
-        run: |
-          mkdir /tmp/digests
-          cp ${{steps.download.outputs.download-path}}/**/* /tmp/digests
+          path: /tmp/digests
+          pattern: digests-*
+          merge-multiple: true
+
       -
         name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3