fix: use static ffmpeg binary for n8n 2.1.0+ compatibility

CHANGELOG.md

@@ -12,6 +12,9 @@ All notable changes to this project are documented in this file.
 - **Update preview** - Preview changes before applying updates
 - **n8n v2.0 support** - Worker-runner sidecar pattern for task execution
 
+### Fixed
+- **n8n 2.1.0+ compatibility** - Switch to static ffmpeg binary (apk removed upstream in n8n 2.1.0)
+
 ## [November 2025]
 
 ### Added

n8n/Dockerfile.n8n

@@ -1,5 +1,9 @@
 FROM n8nio/n8n:stable
 
 USER root
-RUN apk add --no-cache ffmpeg
+# Install static ffmpeg binary (no package manager needed)
+RUN wget -qO- https://johnvansickle.com/ffmpeg/releases/ffmpeg-release-amd64-static.tar.xz | \
+    tar -xJC /tmp && \
+    mv /tmp/ffmpeg-*-static/ffmpeg /tmp/ffmpeg-*-static/ffprobe /usr/local/bin/ && \
+    rm -rf /tmp/ffmpeg-*
 USER node