Use shared check-file action

Author: heiskr

.github/script/check-file.sh

@@ -56,12 +56,10 @@ jobs:
 
       # Verify the learner added the file contents
       - name: Check workflow contents, jobs
-        run: |
-          chmod a+x .github/script/check-file.sh
-          ./.github/script/check-file.sh
-        env:
-          FILE: "index.html"
-          SEARCH: "Hello from the codespace"
+        uses: skills/action-check-file@v1
+        with:
+          file: "index.html"
+          search: "Hello from the codespace"
 
       # In README.md, switch step 1 for step 2.
       - name: Update to step 2

.github/workflows/1-first-codespace.yml

@@ -56,12 +56,10 @@ jobs:
 
       # Verify the devcontainer.json has an image.
       - name: Check devcontainer.json
-        run: |
-          chmod a+x .github/script/check-file.sh
-          ./.github/script/check-file.sh
-        env:
-          FILE: ".devcontainer/devcontainer.json"
-          SEARCH: "mcr.microsoft.com/vscode/devcontainers/universal:latest"
+        uses: skills/action-check-file@v1
+        with:
+          file: ".devcontainer/devcontainer.json"
+          search: "mcr.microsoft.com/vscode/devcontainers/universal:latest"
 
       # In README.md, switch step 2 for step 3.
       - name: Update to step 3

.github/workflows/2-custom-image.yml

@@ -56,12 +56,10 @@ jobs:
 
       # Verify the postCreateCommand was added.
       - name: Check for postCreateCommand
-        run: |
-          chmod a+x .github/script/check-file.sh
-          ./.github/script/check-file.sh
-        env:
-          FILE: ".devcontainer/devcontainer.json"
-          SEARCH: "postCreateCommand"
+        uses: skills/action-check-file@v1
+        with:
+          file: ".devcontainer/devcontainer.json"
+          search: "postCreateCommand"
 
       # In README.md, switch step 3 for step 4.
       - name: Update to step 4

.github/workflows/3-customize-codespace.yml

@@ -58,12 +58,10 @@ jobs:
 
       # Verify the setup.sh added the file contents.
       - name: Check workflow contents, jobs
-        run: |
-          chmod a+x .github/script/check-file.sh
-          ./.github/script/check-file.sh
-        env:
-          FILE: "setup.sh"
-          SEARCH: "install sl"
+        uses: skills/action-check-file@v1
+        with:
+          file: "setup.sh"
+          search: "install sl"
 
       # In README.md, switch step 4 for step X.
       - name: Update to step X