Revert "linkcheck-diff: Use git directly instead of 3rd party action (#3007)" (#3010)

This reverts commit 172bfaa.

Author: sciencewhiz

.github/workflows/CI.yml

@@ -88,40 +88,37 @@ jobs:
       run: |
         sphinx-build -D language=es -b html . _build/html
 
-  link-check-diff:
-    runs-on: ubuntu-22.04
-    steps:
-      - uses: actions/checkout@v4
-        with:
-          fetch-depth: 0
-      - name: Get changed files using git (comparing with main)
-        id: changed-files
-        run: |
-          # Ensure the main branch is fetched
-          git fetch origin main
-          base_ref="origin/main"
-          echo "Using base ref: ${base_ref}"
-          changed_files=$(git diff --name-only "$base_ref" HEAD)
-          echo "Changed files: $changed_files"
-          # Set the output variable using the new GITHUB_OUTPUT file method
-          echo "all_changed_files=$changed_files" >> $GITHUB_OUTPUT
-      - uses: actions/setup-python@v5
-        with:
-          python-version: 3.9
-      - name: Install Dependencies
-        run: pip install -r source/requirements.txt
-      - name: Run linkcheck on .rst files
-        run: |
-          for file in ${{ steps.changed-files.outputs.all_changed_files }}; do
-            if [ "${file: -4}" == ".rst" ]; then
-              var="$var $file"
-            fi
-          done
-          if [ -z "$var" ]; then
-            echo "No *.rst changed files to check."
-          else
-            make BUILDER_ARGS="$var" linkcheck
-          fi
+  #link-check-diff:
+  #  # This job is sourced from https://github.com/aiven/devportal/blob/main/.github/workflows/linkcheck-changed-files.yaml
+  #  # It is CC 4.0 I licensed: https://creativecommons.org/licenses/by/4.0/
+  #  # Changes have been made.
+  #  runs-on: ubuntu-22.04
+  #  steps:
+  #    - uses: actions/checkout@v4
+  #      with:
+  #        fetch-depth: 0
+  #    - name: Get changed files
+  #      id: changed-files
+  #      uses: tj-actions/changed-files@v41
+  #    - uses: actions/setup-python@v5
+  #      with:
+  #        python-version: 3.9
+  #    - name: Install Dependencies
+  #      run: pip install -r source/requirements.txt
+  #    - name: Run linkcheck on .rst files
+  #      run: |
+  #        for file in ${{ steps.changed-files.outputs.all_changed_files }}; do
+  #          if [ "${file: -4}" == ".rst" ]
+  #            then
+  #              var="$var $file"
+  #          fi
+  #        done
+  #        if [ -z "$var" ]
+  #        then
+  #              echo "No *.rst changed files to check."
+  #        else
+  #              make BUILDER_ARGS="$var" linkcheck
+  #        fi
 
   check-linting:
     runs-on: ubuntu-22.04