Use shared check file

Author: heiskr

.github/script/check-file.sh

@@ -56,10 +56,10 @@ jobs:
 
       # Check that there is at least one header in the markdown file.
       - name: Check markdown syntax, header
-        run: ./.github/script/check-file.sh
-        env:
-          FILE: "index.md"
-          SEARCH: "# [a-zA-Z0-9]"
+        uses: skills/action-check-file@v1
+        with:
+          file: "index.md"
+          search: "# [a-zA-Z0-9]"
 
       # In README.md, switch step 1 for step 2.
       - name: Update to step 2

.github/workflows/1-add-headers.yml

@@ -56,10 +56,10 @@ jobs:
 
       # Check that there is at least one image in the markdown file.
       - name: Check markdown syntax, image
-        run: ./.github/script/check-file.sh
-        env:
-          FILE: "index.md"
-          SEARCH: "\\!\\[.*](.*)"
+        uses: skills/action-check-file@v1
+        with:
+          file: "index.md"
+          search: "\\!\\[.*](.*)"
 
       # In README.md, switch step 2 for step 3.
       - name: Update to step 3

.github/workflows/2-add-an-image.yml

@@ -56,10 +56,10 @@ jobs:
 
       # Check that there is at least one code example in the markdown file.
       - name: Check markdown syntax, code example
-        run: ./.github/script/check-file.sh
-        env:
-          FILE: "index.md"
-          SEARCH: "\\`\\`\\`"
+        uses: skills/action-check-file@v1
+        with:
+          file: "index.md"
+          search: "\\`\\`\\`"
 
       # In README.md, switch step 3 for step 4.
       - name: Update to step 4

.github/workflows/3-add-a-code-example.yml

@@ -56,10 +56,10 @@ jobs:
 
       # Make sure there is at least one task list item in the file.
       - name: Check markdown syntax, task list
-        run: ./.github/script/check-file.sh
-        env:
-          FILE: "index.md"
-          SEARCH: "\\- \\[ ] "
+        uses: skills/action-check-file@v1
+        with:
+          file: "index.md"
+          search: "\\- \\[ ] "
 
       # In README.md, switch step 4 for step 5.
       - name: Update to step 5