Enable option to not run spamassassin

Setting the `DISABLE_SPAMASSASSIN=1` env var will start this container
without spamassain.

Makefile

@@ -54,6 +54,12 @@ run:
 		-v "`pwd`/test":/tmp/docker-mailserver-test \
 		-e DISABLE_AMAVIS=1 \
 		-h mail.my-domain.com -t $(NAME)
+	sleep 20
+	docker run -d --name mail_disabled_spamassassin \
+		-v "`pwd`/test/config":/tmp/docker-mailserver \
+		-v "`pwd`/test":/tmp/docker-mailserver-test \
+		-e DISABLE_SPAMASSASSIN=1 \
+		-h mail.my-domain.com -t $(NAME)
 	# Wait for containers to fully start
 	sleep 20
 
@@ -83,4 +89,4 @@ tests:
 
 clean:
 	# Remove running test containers
-	docker rm -f mail mail_pop3 mail_smtponly mail_fail2ban fail-auth-mailer mail_disabled_amavis
+	docker rm -f mail mail_pop3 mail_smtponly mail_fail2ban fail-auth-mailer mail_disabled_amavis mail_disabled_spamassassin

target/start-mailserver.sh

@@ -326,8 +326,10 @@ if [ -f /tmp/docker-mailserver/dovecot.cf ]; then
 fi
 
 # Start services related to SMTP
-/etc/init.d/spamassassin start
 /etc/init.d/clamav-daemon start
+if ! [ "$DISABLE_SPAMASSASSIN" = 1 ]; then
+  /etc/init.d/spamassassin start
+fi
 if ! [ "$DISABLE_AMAVIS" = 1 ]; then
   /etc/init.d/amavis start
 fi

test/tests.bats

@@ -42,6 +42,11 @@
   [ "$status" -eq 1 ]
 }
 
+@test "checking process: spamassassin (spamassassin disabled by DISABLE_SPAMASSASSIN)" {
+  run docker exec mail_disabled_spamassassin /bin/bash -c "ps aux --forest | grep -v grep | grep ''/usr/sbin/spamd'"
+  [ "$status" -eq 1 ]
+}
+
 #
 # imap
 #