Set default TZ in Dockerfiles

core/admin/Dockerfile

@@ -23,6 +23,8 @@ RUN set -eu \
 FROM $DISTRO
 COPY --from=balenalib/rpi-alpine:3.14 /usr/bin/qemu-arm-static /usr/bin/qemu-arm-static
 
+ENV TZ Etc/UTC
+
 # python3 shared with most images
 RUN set -eu \
  && apk add --no-cache python3 py3-pip git bash tzdata \

core/dovecot/Dockerfile

@@ -11,6 +11,9 @@ RUN git clone https://github.com/grosjo/fts-xapian.git \
   && make install
 
 FROM $DISTRO
+
+ENV TZ Etc/UTC
+
 # python3 shared with most images
 RUN apk add --no-cache \
     python3 py3-pip git bash py3-multidict py3-yarl tzdata \

core/nginx/Dockerfile

@@ -1,5 +1,8 @@
 ARG DISTRO=alpine:3.14.2
 FROM $DISTRO
+
+ENV TZ Etc/UTC
+
 # python3 shared with most images
 RUN apk add --no-cache \
     python3 py3-pip git bash py3-multidict \

core/postfix/Dockerfile

@@ -1,5 +1,8 @@
 ARG DISTRO=alpine:3.14.2
 FROM $DISTRO
+
+ENV TZ Etc/UTC
+
 # python3 shared with most images
 RUN apk add --no-cache \
     python3 py3-pip git bash py3-multidict py3-yarl tzdata \

core/rspamd/Dockerfile

@@ -1,5 +1,8 @@
 ARG DISTRO=alpine:3.14.2
 FROM $DISTRO
+
+ENV TZ Etc/UTC
+
 # python3 shared with most images
 RUN apk add --no-cache \
     python3 py3-pip git bash py3-multidict tzdata \

optional/clamav/Dockerfile

@@ -1,5 +1,8 @@
 ARG DISTRO=alpine:3.14.2
 FROM $DISTRO
+
+ENV TZ Etc/UTC
+
 # python3 shared with most images
 RUN apk add --no-cache \
     python3 py3-pip bash tzdata \

optional/fetchmail/Dockerfile

@@ -1,6 +1,8 @@
 ARG DISTRO=alpine:3.14.2
 FROM $DISTRO
 
+ENV TZ Etc/UTC
+
 # python3 shared with most images
 RUN apk add --no-cache \
     python3 py3-pip bash tzdata \

optional/postgresql/Dockerfile

@@ -1,5 +1,8 @@
 ARG DISTRO=alpine:3.14.2
 FROM $DISTRO
+
+ENV TZ Etc/UTC
+
 # python3 shared with most images
 RUN apk add --no-cache \
     python3 py3-pip bash py3-multidict tzdata \

optional/radicale/Dockerfile

@@ -1,6 +1,8 @@
 ARG DISTRO=alpine:3.14.2
 FROM $DISTRO
 
+ENV TZ Etc/UTC
+
 # python3 shared with most images
 RUN apk add --no-cache \
     python3 py3-pip bash tzdata \

optional/traefik-certdumper/Dockerfile

@@ -1,5 +1,7 @@
 FROM ldez/traefik-certs-dumper
 
+ENV TZ Etc/UTC
+
 RUN apk --no-cache add inotify-tools util-linux bash tzdata
 
 COPY run.sh /

optional/unbound/Dockerfile

@@ -1,5 +1,8 @@
 ARG DISTRO=alpine:3.14.2
 FROM $DISTRO
+
+ENV TZ Etc/UTC
+
 # python3 shared with most images
 RUN apk add --no-cache \
     python3 py3-pip git bash py3-multidict tzdata \

webmails/rainloop/Dockerfile

@@ -4,6 +4,8 @@ ARG ARCH=""
 FROM ${ARCH}alpine:3.14
 ONBUILD COPY --from=balenalib/rpi-alpine:3.14 /usr/bin/qemu-arm-static /usr/bin/qemu-arm-static
 
+ENV TZ Etc/UTC
+
 # Shared later between dovecot postfix nginx rspamd rainloop and roundloop
 RUN apk add --no-cache \
     python3 py3-pip tzdata \

webmails/roundcube/Dockerfile

@@ -7,6 +7,9 @@ ONBUILD COPY --from=balenalib/rpi-alpine:3.14 /usr/bin/qemu-arm-static /usr/bin/
 FROM ${ARCH}php:7.4-apache as build_other
 
 FROM build_${QEMU}
+
+ENV TZ Etc/UTC
+
 #Shared layer between rainloop and roundcube
 RUN apt-get update && apt-get install -y \
   python3 curl python3-pip git python3-multidict tzdata \
@@ -21,8 +24,6 @@ ENV ROUNDCUBE_URL https://github.com/roundcube/roundcubemail/releases/download/1
 
 ENV CARDDAV_URL https://github.com/mstilkerich/rcmcarddav/releases/download/v4.1.2/carddav-v4.1.2.tar.gz
 
-ENV TZ Etc/UTC
-
 RUN apt-get update && apt-get install -y \
       zlib1g-dev libzip4 libzip-dev libpq-dev \
       python3-jinja2 \