Fix shell quoting in workflow-command.yml steps

Author: MickeyGithubL

.github/workflows/workflow-command.yml

@@ -1,6 +1,8 @@
 name: "Workflow Commands"
 
-on: ['push']
+on:
+  push:
+    branches: [ main ]
 
 jobs:
   my-job:
@@ -14,7 +16,7 @@ jobs:
           echo "::endgroup::"
       - name: "step 1"
         run: |
-          echo "MY_VAL=hello" >> $GITHUB_ENV"
+          echo "MY_VAL=hello" >> "$GITHUB_ENV"
       - name: "step 2"
         run: |
-          echo $MY_VAL"
+          echo "$MY_VAL"