Merge pull request #1421 from Sapana-Khemkar/ppc64le

edit workflow to add support for ppc64le image generation

Author: Zerpet

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

@@ -106,7 +106,7 @@ jobs:
       uses: docker/build-push-action@v3
       with:
         context: .
-        platforms: linux/amd64, linux/arm64
+        platforms: linux/amd64, linux/arm64, linux/ppc64le
         push: ${{ github.event_name != 'pull_request' }}
         tags: ${{ steps.meta.outputs.tags }}
         labels: ${{ steps.meta.outputs.labels }}
@@ -155,7 +155,7 @@ jobs:
         platforms: linux/arm64
         push: ${{ github.event_name != 'pull_request' }}
         tags: ${{ steps.single-arch-meta-arm64.outputs.tags }}
-        labels: ${{ steps.single-arch-meta-arm64.outputs.labels }}     
+        labels: ${{ steps.single-arch-meta-arm64.outputs.labels }}  
     - name: Build manifest
       if: github.event_name != 'pull_request'
       env: