feat: Add architecture support and improve Dockerfile for multi-platform builds

- Introduced architecture-related build arguments (TARGETOS, TARGETARCH, TARGETVARIANT) to the Dockerfile.
- Updated the build command to use dynamic OS and architecture values.
- Enhanced rclone installation to support multiple architectures (amd64, arm64, arm-v7).
- Updated GitHub workflows to specify supported platforms for Docker builds.

.github/workflows/docker-publish-dockerhub.yml

@@ -96,6 +96,7 @@ jobs:
           push: ${{ github.event_name != 'pull_request' }}
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
+          platforms: linux/amd64,linux/arm64,linux/arm/v7
           build-args: |
             VERSION=${{ env.VERSION }}
             BUILD_TIME=${{ env.BUILD_TIME }}

.github/workflows/docker-publish.yml

@@ -97,6 +97,7 @@ jobs:
           push: ${{ github.event_name != 'pull_request' }}
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
+          platforms: linux/amd64,linux/arm64,linux/arm/v7
           build-args: |
             VERSION=${{ env.VERSION }}
             BUILD_TIME=${{ env.BUILD_TIME }}