Use github cache (#53)

* Cache the zig compiler locally

* logging

* npm update

* verboser

* os.arch

* debug

* log signal

* address actions/toolkit#687

* correct path

* add a cache: false option

* share size

* zigpath

* path.join skull

README.md

@@ -53,6 +53,18 @@ If you are running Zig on Windows machines, you need to make sure that your .zig
 *.zig text eol=lf
 ```
 
+This action caches the downloaded compilers in your repository's Actions cache by default,
+to reduce the load on the Zig Foundation's servers. Cached compilers are only about 60MB
+each per version/OS/architecture.
+
+If this is really bad for you for some reason you can disable the caching.
+
+```yaml
+- uses: goto-bus-stop/setup-zig@v1
+  with:
+    cache: false
+```
+
 ## License
 
 [Apache-2.0](LICENSE.md)

action.yml

@@ -9,6 +9,10 @@ inputs:
     description: 'Version of the zig compiler to use (must be 0.3.0 or up)'
     required: true
     default: '0.5.0'
+  cache:
+    description: 'Cache downloaded compilers for faster action runs. Strongly recommended.'
+    required: false
+    default: 'true'
 runs:
   using: 'node12'
   main: 'dist/index.js'