[#500] Added alpine linux, good for testing

We should consider creating a help document for those
who install Alpine linux.

lib/Ravada.pm

@@ -171,7 +171,17 @@ sub _update_isos {
     my $table = 'iso_images';
     my $field = 'name';
     my %data = (
-        artful => {
+        alpine_37 => {
+                    name => 'Alpine 3.7'
+            ,description => 'Alpine Linux 3.7 64 bits ( Minimal Linux Distribution)'
+                   ,arch => 'amd64'
+                    ,xml => 'yakkety64-amd64.xml'
+             ,xml_volume => 'yakkety64-volume.xml'
+                    ,url => 'http://dl-cdn.alpinelinux.org/alpine/v3.7/releases/x86_64/'
+                ,file_re => 'alpine-virt-3.7.\d+-x86_64.iso'
+                ,sha256_url => 'http://dl-cdn.alpinelinux.org/alpine/v3.7/releases/x86_64/alpine-virt-3.7.0-x86_64.iso.sha256'
+        }
+        ,artful => {
                     name => 'Ubuntu Artful Aardvark'
             ,description => 'Ubuntu 17.10 Artful Aardvark 64 bits'
                    ,arch => 'amd64'