misc: cleanup Dockerfiles

* Cleanup: Use spaces instead of tabulation

* Cleanup: Reduce layers

* Cleanup: Homogeneise wget syntax

* Cleanup: Use binary GPG key format

jvb/Dockerfile

@@ -2,10 +2,9 @@ ARG JITSI_REPO=jitsi
 ARG BASE_TAG=latest
 FROM ${JITSI_REPO}/base-java:${BASE_TAG}
 
-RUN \
-	apt-dpkg-wrap apt-get update && \
-	apt-dpkg-wrap apt-get install -y jitsi-videobridge2 jq curl iproute2 && \
-	apt-cleanup
+RUN apt-dpkg-wrap apt-get update && \
+    apt-dpkg-wrap apt-get install -y jitsi-videobridge2 jq curl iproute2 && \
+    apt-cleanup
 
 COPY rootfs/ /