chore: skip steps if auth is unavailable

This is especially useful for external PR contributions

Author: byCedric

.github/workflows/test.yml

@@ -41,12 +41,14 @@ jobs:
         run: eas --version
 
       - name: 🧪 EAS authenticated
+        if: ${{ secrets.EXPO_TOKEN }}
         run: eas whoami
 
       - name: 🧪 Expo installed
         run: expo --version
 
       - name: 🧪 Expo authenticated
+        if: ${{ secrets.EXPO_TOKEN }}
         run: expo whoami
 
   preview-comment:
@@ -80,6 +82,7 @@ jobs:
             if (!message) throw new Error('Message output is empty')
       
       - name: 🧪 Comment on PR (github-token)
+        if: ${{ secrets.EXPO_TOKEN }}
         uses: ./preview-comment
         env:
           EXPO_TEST_GITHUB_PULL: 149
@@ -88,6 +91,7 @@ jobs:
           channel: test
 
       - name: 🧪 Comment on PR (GITHUB_TOKEN)
+        if: ${{ secrets.EXPO_TOKEN }}
         uses: ./preview-comment
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
@@ -96,5 +100,3 @@ jobs:
           project: ./temp
           channel: test
           github-token: badtoken
-
-