dovecot: added timeout option when sa-rules cannot be downloaded (#6025)

* dovecot: added timeout option when sa-rules cannot be downloaded

* dovecot: changed sa-rules exit code to 0 to allow dovecot to start afterwards

data/Dockerfiles/dovecot/sa-rules.sh

@@ -11,10 +11,14 @@ else
 fi
 
 # Deploy
-curl --connect-timeout 15 --retry 10 --max-time 30 https://www.spamassassin.heinlein-support.de/$(dig txt 1.4.3.spamassassin.heinlein-support.de +short | tr -d '"' | tr -dc '0-9').tar.gz --output /tmp/sa-rules-heinlein.tar.gz
-if gzip -t /tmp/sa-rules-heinlein.tar.gz; then
-  tar xfvz /tmp/sa-rules-heinlein.tar.gz -C /tmp/sa-rules-heinlein
-  cat /tmp/sa-rules-heinlein/*cf > /etc/rspamd/custom/sa-rules
+if curl --connect-timeout 15 --retry 10 --max-time 30 https://www.spamassassin.heinlein-support.de/$(dig txt 1.4.3.spamassassin.heinlein-support.de +short | tr -d '"' | tr -dc '0-9').tar.gz --output /tmp/sa-rules-heinlein.tar.gz; then
+  if gzip -t /tmp/sa-rules-heinlein.tar.gz; then
+    tar xfvz /tmp/sa-rules-heinlein.tar.gz -C /tmp/sa-rules-heinlein
+    cat /tmp/sa-rules-heinlein/*cf > /etc/rspamd/custom/sa-rules
+  fi
+else
+  echo "Failed to download SA rules. Exiting."
+  exit 0 # Must be 0 otherwise dovecot would not start at all
 fi
 
 sed -i -e 's/\([^\\]\)\$\([^\/]\)/\1\\$\2/g' /etc/rspamd/custom/sa-rules