feat(docker): add multi-architecture support for Docker images

Add support for linux/amd64, linux/arm64, and linux/arm/v7 architectures in Docker builds. Update CI workflow to use QEMU and build for all target platforms. Documentation has been updated to reflect these changes.

Author: painteau

.github/workflows/docker-publish.yml

@@ -38,6 +38,9 @@ jobs:
         with:
           cosign-release: 'v2.2.4'
 
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
       # Set up BuildKit Docker container builder to be able to build
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@f95db51fddba0c2d1ec667646a06c2ce06100226 # v3.0.0
@@ -70,8 +73,7 @@ jobs:
           labels: ${{ steps.meta.outputs.labels }}
           cache-from: type=gha
           cache-to: type=gha,mode=max
-          platforms: linux/arm64/v8,linux/amd64
-          # For old raspberry pi : linux/arm/v7
+          platforms: linux/amd64,linux/arm64,linux/arm/v7
 
       - name: Sign the published Docker image
         if: ${{ github.event_name != 'pull_request' }}

CHANGELOG.md

@@ -12,6 +12,7 @@ The format is inspired by [Keep a Changelog](https://keepachangelog.com/en/1.1.0
 - Example `curl` calls for `/scrape` and `/health` endpoints.
 - MIT license file.
 - Optional API key authentication via the `API_KEY` environment variable.
+- Multi-architecture Docker support: `linux/amd64`, `linux/arm64`, and `linux/arm/v7`.
 
 ### Changed
 

README.md

@@ -2,6 +2,11 @@
 
 Minimal HTTP service to download Instagram posts (Reels or regular posts) via a JSON API, built with Flask and Instaloader and packaged as a Docker container.
 
+This Docker image is compatible with the following architectures:
+- `linux/amd64` (x86_64)
+- `linux/arm64` (Apple Silicon, Raspberry Pi 4/5)
+- `linux/arm/v7` (Raspberry Pi 3, etc.)
+
 ## Features
 
 - `/scrape` endpoint to download an Instagram post from its URL.