Adding tzdata to container

To be able to set a timezone inside a container with the env variable TZ
the tzdata package is needed. Otherwise only UTC will be set.

docker/amd64/Dockerfile.alpine

@@ -82,6 +82,7 @@ ENV SSL_CERT_DIR=/etc/ssl/certs
 RUN mkdir /data \
     && apk add --no-cache \
         openssl \
+        tzdata \
         curl \
         dumb-init \
         postgresql-libs \