Release v2.1.5 (#2462)

* bump version
* update release notes
* run some behave tests on v15
* automate release process by building/pushing packages on tag creation and release publication

Dockerfile

@@ -1,6 +1,6 @@
 ## This Dockerfile is meant to aid in the building and debugging patroni whilst developing on your local machine
 ## It has all the necessary components to play/debug with a single node appliance, running etcd
-ARG PG_MAJOR=14
+ARG PG_MAJOR=15
 ARG COMPRESS=false
 ARG PGHOME=/home/postgres
 ARG PGDATA=$PGHOME/data
@@ -117,7 +117,7 @@ RUN if [ "$COMPRESS" = "true" ]; then \
 FROM scratch
 COPY --from=builder / /
 
-LABEL maintainer="Alexander Kukushkin <alexander.kukushkin@zalando.de>"
+LABEL maintainer="Alexander Kukushkin <akukushkin@microsoft.com>"
 
 ARG PG_MAJOR
 ARG COMPRESS
@@ -155,4 +155,4 @@ RUN sed -i 's/env python/&3/' /patroni*.py \
 
 USER postgres
 
-ENTRYPOINT ["/bin/sh", "/entrypoint.sh"]
+ENTRYPOINT ["/bin/sh", "/entrypoint.sh"]