update github action

- apparently it needs sudo with no password to npm install?
- also added ability to run the json update action manually

.github/scripts/minify-map-json.sh

@@ -1,4 +1,4 @@
-npm install -g mapshaper
+sudo npm install -g mapshaper
 mapshaper ./boundaries.geo.json snap -clean -o force precision=0.0001 format=geojson ./boundaries.geo.json
-npm install -g topojson-server
+sudo npm install -g topojson-server
 geo2topo ./boundaries.geo.json -q 50000 > ./website/data/boundaries.topo.json

.github/workflows/minify-map-json.yml

@@ -5,6 +5,7 @@ on:
       - master
     paths:
       - 'boundaries.geo.json'
+  workflow_dispatch:
 jobs:
   prepare:
     runs-on: ubuntu-latest