fix: syntax

Author: timbru31

.github/workflows/buildx.yml

@@ -75,15 +75,22 @@ jobs:
         with:
           install: true
 
+      - name: Set build path
+        id: buildpath
+        run: |
+          if [ "${{ matrix.variant }}" = "default" ]; then
+            echo "path=./${{ matrix.ruby-version }}/${{ matrix.node-version }}" >> $GITHUB_OUTPUT
+          else
+            echo "path=./${{ matrix.ruby-version }}/${{ matrix.node-version }}/${{ matrix.variant }}" >> $GITHUB_OUTPUT
+          fi
+
       - name: Docker Buildx (build)
         uses: docker/[email protected]
-        env:
-          BUILD_PATH: ./${{ matrix.ruby-version }}/${{ matrix.node-version }}${{ matrix.variant == 'default' && '' || '/${{ matrix.variant }}' }}
         if: success() && !contains(github.ref, 'master')
         with:
           push: false
-          context: ${{ env.BUILD_PATH }}
-          file: ./${{ matrix.ruby-version }}/${{ matrix.node-version }}${{ matrix.variant != 'default' && '/${{ matrix.variant }}' || '' }}/Dockerfile
+          context: ${{ steps.buildpath.outputs.path }}
+          file: ${{ steps.buildpath.outputs.path }}/Dockerfile
           build-args: REFRESHED_AT=$(date +%Y-%m-%d)
           platforms: ${{ matrix.platforms }}
           tags: ${{ steps.prepare.outputs.tags }}
@@ -97,13 +104,11 @@ jobs:
 
       - name: Docker Buildx (push)
         uses: docker/[email protected]
-        env:
-          BUILD_PATH: ./${{ matrix.ruby-version }}/${{ matrix.node-version }}${{ matrix.variant == 'default' && '' || '/${{ matrix.variant }}' }}
         if: success() && github.event_name != 'pull_request' && contains(github.ref, 'master')
         with:
           push: true
-          context: ${{ env.BUILD_PATH }}
-          file: ./${{ matrix.ruby-version }}/${{ matrix.node-version }}${{ matrix.variant != 'default' && '/${{ matrix.variant }}' || '' }}/Dockerfile
+          context: ${{ steps.buildpath.outputs.path }}
+          file: ${{ steps.buildpath.outputs.path }}/Dockerfile
           build-args: REFRESHED_AT=$(date +%Y-%m-%d)
           platforms: ${{ matrix.platforms }}
           tags: ${{ steps.prepare.outputs.tags }}