docker: add annotations

scripts/docker/Dockerfile.im

@@ -3,11 +3,18 @@ WORKDIR /z
 
 RUN     apk --no-cache add \
             wget \
-            py3-pillow \
+            py3-pillow py3-mutagen \
         && mkdir /cfg /w \
         && chmod 777 /cfg /w \
         && echo % /cfg > initcfg
 
 COPY    i/dist/copyparty-sfx.py ./
 WORKDIR /w
+EXPOSE  3923
 ENTRYPOINT ["python3", "/z/copyparty-sfx.py", "-c", "/z/initcfg"]
+
+LABEL   org.opencontainers.image.url="https://github.com/9001/copyparty" \
+        org.opencontainers.image.source="https://github.com/9001/copyparty/tree/hovudstraum/scripts/docker" \
+        org.opencontainers.image.licenses="MIT" \
+        org.opencontainers.image.title="copyparty-im" \
+        org.opencontainers.image.description="copyparty with Pillow and Mutagen (image thumbnails, media tags)"