feat: initial gcs cacher integration (#6)

action.yml

@@ -1,11 +1,17 @@
-name: 'Your name here'
-description: 'Provide a description here'
-author: 'Your name or organization here'
+name: 'gcs-cache-action'
+description: 'GitHub Actions wrapper around gcs-cacher'
+author: 'Shakr Media Co., Ltd.'
 inputs:
-  milliseconds: # change this
+  path:
     required: true
-    description: 'input description here'
-    default: 'default value if applicable'
+    description: 'path to cache (must be directory)'
+  key:
+    required: true
+    description: 'primary cache key'
+  restore_keys:
+    required: true
+    description: 'multiline string of cache keys for partial matching'
 runs:
   using: 'node12'
-  main: 'dist/index.js'
+  main: 'dist/restore/index.js'
+  post: 'dist/save/index.js'