Tag Private ECR images in release workflow (#1354)

*Issue #, if available:*

*Description of changes:*
Add tagging to the per-arch images in private ECR as needed by ARS.

By submitting this pull request, I confirm that my contribution is made
under the terms of the Apache 2.0 license.

---------

Co-authored-by: ADOT Patch workflow <adot-patch-workflow@github.com>

Author: ezhang6811

.github/workflows/release-build.yml

@@ -208,7 +208,27 @@ jobs:
         shell: bash
         run: .github/scripts/test-adot-javaagent-image.sh "${{ env.TEST_TAG }}" "$VERSION"
 
-      - name: Build and push image
+      - name: Build and push amd64 image to private ECR
+        uses: docker/build-push-action@263435318d21b8e681c14492fe198d362a7d2c83 #v6.18.0
+        with:
+          push: true
+          build-args: "ADOT_JAVA_VERSION=${{ env.VERSION }}"
+          context: .
+          platforms: linux/amd64
+          tags: |
+            ${{ env.PRIVATE_REPOSITORY }}:v${{ env.VERSION }}-amd64
+
+      - name: Build and push arm64 image to private ECR
+        uses: docker/build-push-action@263435318d21b8e681c14492fe198d362a7d2c83 #v6.18.0
+        with:
+          push: true
+          build-args: "ADOT_JAVA_VERSION=${{ env.VERSION }}"
+          context: .
+          platforms: linux/arm64
+          tags: |
+            ${{ env.PRIVATE_REPOSITORY }}:v${{ env.VERSION }}-arm64
+
+      - name: Build and push multi-arch image
         uses: docker/build-push-action@263435318d21b8e681c14492fe198d362a7d2c83 #v6.18.0
         with:
           push: true