install "wget" in streaming Dockerfile (#28497)

streaming/Dockerfile

@@ -69,6 +69,7 @@ RUN \
     ca-certificates \
     curl \
     tzdata \
+    wget \
   ;
 
 # Set /opt/mastodon as working directory
@@ -101,4 +102,4 @@ USER mastodon
 # Expose default Streaming ports
 EXPOSE 4000
 # Run streaming when started
-CMD [ node ./streaming/index.js ]
+CMD [ node ./streaming/index.js ]