ci(check-files): check for unreachable files

Use the delta script to check for any new unreachable collateral files.
This will indicate when files not directly part of the documentation
should be cleaned up.

Signed-off-by: Randolph Sapp <rs@ti.com>

Author: StaticRocket

.github/workflows/check-files.yml

@@ -0,0 +1,69 @@
+---
+name: "check_toc_txt"
+
+on:
+  pull_request:
+    branches: [master]
+    paths:
+      - 'source/**'
+
+defaults:
+  run:
+    shell: bash
+
+jobs:
+  lint:
+    name: Lint
+    runs-on: ubuntu-latest
+    container:
+      image: ghcr.io/texasinstruments/processor-sdk-doc:latest
+      options: --entrypoint /bin/bash
+    permissions:
+      contents: read
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Update refs and settings
+        run: |
+          git config --global --add safe.directory "$PWD"
+          git switch -C pr
+          git fetch --no-tags --depth=1 origin master
+          git switch master
+
+      - name: Run check-files.sh
+        run: |
+          # Disable color output
+          export NO_COLOR=true
+
+          # Run the test
+          bin/delta.sh -a master -b pr -- ./bin/check-files.sh
+
+          # Prepare summary
+          WARNING_COUNT=$(wc -l < _new-warn.log)
+          if [ "$WARNING_COUNT" -gt "0" ]; then
+            echo "New issues found with check-files.sh:"
+            echo '```text'
+            cat _new-warn.log
+            echo '```'
+          else
+            echo "No new issues found with check-files.sh"
+          fi >> "$GITHUB_STEP_SUMMARY"
+
+          # Prepare the artifacts
+          mkdir -p ./results
+          echo "${{ github.event.number }}" > ./results/id
+          cp "$GITHUB_STEP_SUMMARY" ./results/summary
+          echo "$(wc -l < _new-warn.log)" > ./results/problem-count
+
+          # Exit with error if there are new warnings
+          [ "$WARNING_COUNT" -eq "0" ]
+
+      - name: Save results
+        uses: actions/upload-artifact@v4
+        if: always()
+        with:
+          name: results
+          path: results/
+          retention-days: 1

.github/workflows/comment.yml

@@ -6,6 +6,7 @@ on:
     workflows:
       - rstcheck
       - check_toc_txt
+      - check-files
     types:
       - completed