Add ffmpeg and imagemagick to docker image

CHANGELOG.md

@@ -7,6 +7,10 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 
 ## [Unreleased]
 
+### Added
+
+* Added ffmpeg and ImageMagick to Docker image to support specialized thumbnail types.
+
 ### Fixed
 
 * Handle guest accounts properly. Previously they were still declined, though by coincidence.

Dockerfile

@@ -21,7 +21,9 @@ COPY --from=builder /opt/bin/media_repo /opt/bin/import_synapse /opt/bin/gdpr_ex
 RUN apk add --no-cache \
         su-exec \
         ca-certificates \
-        dos2unix
+        dos2unix \
+        imagemagick \
+        ffmpeg
 
 COPY ./config.sample.yaml /etc/media-repo.yaml.sample
 COPY ./docker/run.sh /usr/local/bin/