reproducible alpine/archlinux: bump workers to 8

Signed-off-by: Holger Levsen <holger@layer-acht.org>

job-cfg/reproducible.yaml

@@ -902,6 +902,26 @@
                     my_num: 3
                     op_descname: 'an alpine'
                     my_disabled: false
+                - 'alpine':
+                    my_num: 4
+                    op_descname: 'an alpine'
+                    my_disabled: false
+                - 'alpine':
+                    my_num: 5
+                    op_descname: 'an alpine'
+                    my_disabled: false
+                - 'alpine':
+                    my_num: 6
+                    op_descname: 'an alpine'
+                    my_disabled: false
+                - 'alpine':
+                    my_num: 7
+                    op_descname: 'an alpine'
+                    my_disabled: false
+                - 'alpine':
+                    my_num: 8
+                    op_descname: 'an alpine'
+                    my_disabled: false
                 - 'archlinux':
                     my_num: 1
                     op_descname: 'an Arch Linux'
@@ -926,6 +946,14 @@
                     my_num: 6
                     op_descname: 'an Arch Linux'
                     my_disabled: false
+                - 'archlinux':
+                    my_num: 7
+                    op_descname: 'an Arch Linux'
+                    my_disabled: false
+                - 'archlinux':
+                    my_num: 8
+                    op_descname: 'an Arch Linux'
+                    my_disabled: false
                 - 'fedora-23_x86_64':
                     my_num: 1
                     op_descname: 'a Fedora 23'