Support all platforms in Alpine Amazon ECR builds

NGINX mainline and stable slim builds were missing some platforms

Author: alessfg

.github/workflows/alpine-mainline.yml

@@ -257,7 +257,7 @@ jobs:
       - name: Build and push NGINX mainline slim Alpine image to Amazon ECR
         uses: docker/build-push-action@v3
         with:
-          platforms: linux/amd64, linux/arm64
+          platforms: linux/amd64, linux/arm/v6, linux/arm/v7, linux/arm64, linux/386, linux/ppc64le, linux/s390x
           context: "{{ defaultContext }}:mainline/alpine-slim"
           tags: public.ecr.aws/nginx/nginx-unprivileged:${{ needs.version.outputs.major }}.${{ needs.version.outputs.minor }}.${{ needs.version.outputs.patch }}-alpine-slim, public.ecr.aws/nginx/nginx-unprivileged:mainline-alpine-slim, public.ecr.aws/nginx/nginx-unprivileged:1-alpine-slim, public.ecr.aws/nginx/nginx-unprivileged:${{ needs.version.outputs.major }}.${{ needs.version.outputs.minor }}-alpine-slim, public.ecr.aws/nginx/nginx-unprivileged:alpine-slim
           push: true

.github/workflows/alpine-stable.yml

@@ -253,7 +253,7 @@ jobs:
       - name: Build and push NGINX stable slim Alpine image to Amazon ECR
         uses: docker/build-push-action@v3
         with:
-          platforms: linux/amd64, linux/arm64
+          platforms: linux/amd64, linux/arm/v6, linux/arm/v7, linux/arm64, linux/386, linux/ppc64le, linux/s390x
           context: "{{ defaultContext }}:stable/alpine-slim"
           tags: public.ecr.aws/nginx/nginx-unprivileged:${{ needs.version.outputs.major }}.${{ needs.version.outputs.minor }}.${{ needs.version.outputs.patch }}-alpine-slim, public.ecr.aws/nginx/nginx-unprivileged:stable-alpine-slim, public.ecr.aws/nginx/nginx-unprivileged:${{ needs.version.outputs.major }}.${{ needs.version.outputs.minor }}-alpine-slim
           push: true