Fix Dockerfiles

docs/Dockerfile

@@ -30,7 +30,7 @@ FROM nginx:1.25.5-alpine
 ARG version=master
 ARG pinned_version=master
 ENV VERSION=$version
-ENV TZ Etc/UTC
+ENV TZ=Etc/UTC
 LABEL version=$VERSION
 
 COPY ./nginx.conf /etc/nginx/conf.d/default.conf

docs/requirements.txt

@@ -1,5 +1,5 @@
 recommonmark==0.7.1
-Sphinx==7.3.7
+Sphinx==8.1.3
 sphinx-autobuild==2024.4.16
-sphinx-rtd-theme==2.0.0
+sphinx-rtd-theme==3.0.2
 docutils==0.21.2

optional/traefik-certdumper/Dockerfile

@@ -3,8 +3,8 @@
 # cert dumper image
 FROM ldez/traefik-certs-dumper
 
-ENV TZ Etc/UTC
-ENV LANG C.UTF-8
+ENV TZ=Etc/UTC
+ENV LANG=C.UTF-8
 
 ARG VERSION
 LABEL version=$VERSION

webmails/Dockerfile

@@ -28,8 +28,8 @@ RUN set -euxo pipefail \
   ; mkdir -p /run/nginx /conf
 
 # roundcube
-ENV ROUNDCUBE_URL https://github.com/roundcube/roundcubemail/releases/download/1.6.9/roundcubemail-1.6.9-complete.tar.gz
-ENV CARDDAV_URL https://github.com/mstilkerich/rcmcarddav/releases/download/v5.1.0/carddav-v5.1.0.tar.gz
+ENV ROUNDCUBE_URL=https://github.com/roundcube/roundcubemail/releases/download/1.6.9/roundcubemail-1.6.9-complete.tar.gz
+ENV CARDDAV_URL=https://github.com/mstilkerich/rcmcarddav/releases/download/v5.1.0/carddav-v5.1.0.tar.gz
 
 RUN set -euxo pipefail \
   ; cd /var/www \
@@ -54,7 +54,7 @@ COPY roundcube/config/config.inc.carddav.php /var/www/roundcube/plugins/carddav/
 
 # snappymail
 
-ENV SNAPPYMAIL_URL https://github.com/the-djmaze/snappymail/releases/download/v2.38.2/snappymail-2.38.2.tar.gz
+ENV SNAPPYMAIL_URL=https://github.com/the-djmaze/snappymail/releases/download/v2.38.2/snappymail-2.38.2.tar.gz
 
 RUN set -euxo pipefail \
   ; mkdir  /var/www/snappymail \