workflows: quote the regex for tag detection (#61)

* workflows: quote the regex for tag detection
* workflows: add manual run for unstable release

Signed-off-by: Patrick Stephens <pat@calyptia.com>

Author: Pat

.github/workflows/packages.yaml

@@ -6,7 +6,8 @@ on:
       - master
     # Any tag starting with 'v'
     tags:
-      - v*
+      - 'v*'
+  workflow_dispatch:
 
 jobs:
   build-distro-packages: