Add multi-architecture Docker image support (amd64, arm64, arm/v7)

Co-authored-by: fffaraz <895678+fffaraz@users.noreply.github.com>
Agent-Logs-Url: https://github.com/fffaraz/fakessh/sessions/ec11c290-bdbf-42a4-9af0-3768eba877a1

Author: Copilot

.github/workflows/docker-image.yml

@@ -19,6 +19,9 @@ jobs:
     steps:
     - uses: actions/checkout@v4
 
+    - name: Set up QEMU
+      uses: docker/setup-qemu-action@v3
+
     - name: Set up Docker Buildx
       uses: docker/setup-buildx-action@v3
 
@@ -43,6 +46,7 @@ jobs:
       uses: docker/build-push-action@v6
       with:
         context: .
+        platforms: linux/amd64,linux/arm64,linux/arm/v7
         push: ${{ github.event_name == 'push' }}
         tags: ${{ steps.meta.outputs.tags }}
         labels: ${{ steps.meta.outputs.labels }}