multi-arch support for create-draft-release workflow

Author: pacostas

.github/workflows/create-draft-release.yml

@@ -118,6 +118,43 @@ jobs:
         token: ${{ secrets.PAKETO_BOT_GITHUB_TOKEN }}
         buildpack_type: ${{ steps.get_buildpack_type.outputs.buildpack_type }}
 
+    - name: Create release assets
+      id: create_release_assets
+      run: |
+        release_assets=$(jq -n --arg repo_name "${{ github.event.repository.name }}" --arg tag "${{ steps.tag.outputs.tag }}" '
+        [
+          {
+            "path": "build/buildpack.tgz",
+            "name": ($repo_name + "-" + $tag + ".tgz"),
+            "content_type": "application/gzip"
+          }
+        ]')
+
+        for filepath in build/*.cnb; do
+
+          filename=$(basename "$filepath")
+          asset_name=""
+          if [[ "$filename" == "buildpackage-linux-amd64.cnb" ]]; then
+            asset_name="${{ github.event.repository.name }}-${{ steps.tag.outputs.tag }}.cnb"
+          elif [[ "$filename" == "buildpackage.cnb" ]]; then
+            asset_name="${{ github.event.repository.name }}-${{ steps.tag.outputs.tag }}.cnb"
+          else
+            asset_name="${{ github.event.repository.name }}-${{ steps.tag.outputs.tag }}-${filename}"
+          fi
+
+          release_assets=$(echo "$release_assets" | jq --arg asset_name "${asset_name}" --arg filepath "$filepath" '
+          . + [
+            {
+              "path": $filepath,
+              "name": $asset_name,
+              "content_type": "application/gzip"
+            }
+          ]')
+        done
+
+        release_assets=$(jq -c <<< "$release_assets" )
+        printf "release_assets=%s\n" "${release_assets}" >> "$GITHUB_OUTPUT"
+
     - name: Create Release
       uses: paketo-buildpacks/github-config/actions/release/create@main
       with:
@@ -128,19 +165,7 @@ jobs:
         name: v${{ steps.tag.outputs.tag }}
         body: ${{ steps.create-release-notes.outputs.release_body }}
         draft: true
-        assets: |
-          [
-            {
-              "path": "build/buildpack.tgz",
-              "name": "${{ github.event.repository.name }}-${{ steps.tag.outputs.tag }}.tgz",
-              "content_type": "application/gzip"
-            },
-            {
-              "path": "build/buildpackage.cnb",
-              "name": "${{ github.event.repository.name }}-${{ steps.tag.outputs.tag }}.cnb",
-              "content_type": "application/gzip"
-            }
-          ]
+        assets: ${{ steps.create_release_assets.outputs.release_assets }}
 
   failure:
     name: Alert on Failure