Update varnish stability tag to 4.18.0

Add nginx 1.26, drop 1.24

Migrate to msmtp for mail sending

Update php stability tag to 4.43.2

Update node stability tag to 1.28.0

Update node versions

Add init to crond and adminer

Update memcached stability tag to 2.15.2

Update nginx versions

Update redis stability tag to 4.0.3