Bug 42861: System warning about missing encryption_key on a fresh instance

This patch updates the koha-create command to generate the random encryption key
using pwgen with the number of characters set to 32.

Test plan:
1. In ktd, create a new instance:
    - sudo koha-create --create-db test1
    - Check the /etc/koha/sites/test1/koha-conf.xml file and verify that the encryption_key
    is having the placeholder text '__ENCRYPTION_KEY__'

2. Apply the patch and copy the new koha-create command
    - git bz apply 42861
    - sudo cp /kohadevbox/koha/debian/scripts/koha-create /usr/sbin/koha-create

3. In ktd, create a new instance:
    - sudo koha-create --create-db test2
    - Check the /etc/koha/sites/test2/koha-conf.xml file and verify that the encryption_key
    is generated and has 32 characters random string.

4. Sign-off

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Tomás Cohen Arazi <tomascohen@theke.io>
Signed-off-by: Pedro Amorim <pedro.amorim@openfifth.co.uk>

debian/scripts/koha-create

@@ -138,6 +138,7 @@ generate_config_file() {
         -e "s#__TEMPLATE_CACHE_DIR__#$TEMPLATE_CACHE_DIR#g" \
         -e "s#__TIMEZONE__#$TIMEZONE#g" \
         -e "s#__BCRYPT_SETTINGS__#$BCRYPT_SETTINGS#g" \
+        -e "s#__ENCRYPTION_KEY__#$ENCRYPTION_KEY#g" \
         -e "s#__UPLOAD_PATH__#$UPLOAD_PATH#g" \
         -e "s#__TMP_PATH__#$TMP_PATH#g" \
         -e "s/__LOG_DIR__/\/var\/log\/koha\/$name/g" \
@@ -650,7 +651,7 @@ if [ "${CLO_ELASTICSEARCH_SERVER}" != "" ]; then
 fi
 
 BCRYPT_SETTINGS=$(htpasswd -bnBC 10 "" password | tr -d ':\n' | sed 's/$2y/$2a/');
-
+ENCRYPTION_KEY="$(pwgen -s 32 1)"
 
 if [ "$ENABLE_SRU" != "no" ]; then
     enable_sru_server