misc: cleanup Dockerfiles

* Cleanup: Use spaces instead of tabulation

* Cleanup: Reduce layers

* Cleanup: Homogeneise wget syntax

* Cleanup: Use binary GPG key format

jigasi/Dockerfile

@@ -4,10 +4,9 @@ FROM ${JITSI_REPO}/base-java:${BASE_TAG}
 
 ENV GOOGLE_APPLICATION_CREDENTIALS /config/key.json
 
-RUN \
-	apt-dpkg-wrap apt-get update && \
-	apt-dpkg-wrap apt-get install -y jigasi jq && \
-	apt-cleanup
+RUN apt-dpkg-wrap apt-get update && \
+    apt-dpkg-wrap apt-get install -y jigasi jq && \
+    apt-cleanup
 
 COPY rootfs/ /