Fix for github actions warning about inputs

.github/workflows/test.yml

@@ -9,7 +9,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v1
+    - id: metadata
+      name: Get Git Metadata
+      uses: WPMedia/git-version-action@v1
     - uses: ./
       with:
         token: ${{ secrets.SLACK_BOT_TOKEN }}
-        payload: '{ "channel": "#publishing-tools-ops", "text": "Slack message test for `${{ github.repository }}@${{ github.sha }}` " }'
+        payload: '{ "channel": "#publishing-tools-ops", "text": "Slack message test for `${{ github.repository }}@${{ steps.metadata.outputs.git_version }}` " }'

action.yml

@@ -1,8 +1,10 @@
 name: 'Slack'
 description: 'This GitHub action wraps the Slack API method for posting to channels, private groups, and DMs.'
-outputs:
-  slack_token:
+inputs:
+  token:
+    required: true
   payload:
+    required: true
 runs:
   using: 'node12'
   main: 'dist/index.js'