Use shared check-file action

Author: heiskr

.github/script/check-file.sh

@@ -56,10 +56,10 @@ jobs:
 
       # Verify the learner added the file contents.
       - name: Check workflow contents, name
-        run: ./.github/script/check-file.sh
-        env:
-          FILE: ".github/workflows/welcome.yml"
-          SEARCH: "name:"
+        uses: skills/action-check-file@v1
+        with:
+          file: ".github/workflows/welcome.yml"
+          search: "name:"
 
       # In README.md, switch step 1 for step 2.
       - name: Update to step 2

.github/workflows/1-create-a-workflow.yml

@@ -56,10 +56,10 @@ jobs:
 
       # Verify the learner added the file contents.
       - name: Check workflow contents, jobs
-        run: ./.github/script/check-file.sh
-        env:
-          FILE: ".github/workflows/welcome.yml"
-          SEARCH: "jobs:"
+        uses: skills/action-check-file@v1
+        with:
+          file: ".github/workflows/welcome.yml"
+          search: "jobs:"
 
       # In README.md, switch step 2 for step 3.
       - name: Update to step 3

.github/workflows/2-add-a-job.yml

@@ -56,10 +56,10 @@ jobs:
 
       # Verify the learner added the file contents.
       - name: Check workflow contents, steps
-        run: ./.github/script/check-file.sh
-        env:
-          FILE: ".github/workflows/welcome.yml"
-          SEARCH: "steps:"
+        uses: skills/action-check-file@v1
+        with:
+          file: ".github/workflows/welcome.yml"
+          search: "steps:"
 
       # In README.md, switch step 3 for step 4.
       - name: Update to step 4