jigasi: add missing transcription volumes to dockerfile

jigasi/Dockerfile

@@ -10,4 +10,4 @@ RUN \
 
 COPY rootfs/ /
 
-VOLUME /config
+VOLUME ["/config", "/tmp/transcripts"]

web/Dockerfile

@@ -13,4 +13,4 @@ COPY rootfs/ /
 
 EXPOSE 80 443
 
-VOLUME ["/config", "/etc/letsencrypt"]
+VOLUME ["/config", "/etc/letsencrypt", "/usr/share/jitsi-meet/transcripts"]