fix: replace dorny/paths-filter with native git diff

Replace third-party dorny/paths-filter action with a bash-based
git diff approach. The Azure org likely restricts allowed actions
to first-party (actions/*, github/*, microsoft/*) only, which
would explain the persistent startup_failure on CI workflow.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: vicperdana

.github/workflows/ci.yml

@@ -19,19 +19,20 @@ jobs:
       vscode: ${{ steps.filter.outputs.vscode }}
     steps:
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
-      - uses: dorny/paths-filter@de90cc6fb38fc0963ad72b210f1f284cd68cea36 # v3.0.2
-        id: filter
         with:
-          filters: |
-            psdocs:
-              - 'packages/psdocs/**'
-              - 'build/**'
-            psdocs-azure:
-              - 'packages/psdocs-azure/**'
-              - 'packages/psdocs/**'
-              - 'build/**'
-            vscode:
-              - 'packages/vscode-extension/**'
+          fetch-depth: 0
+      - name: Detect changed paths
+        id: filter
+        run: |
+          if [ "${{ github.event_name }}" = "push" ]; then
+            BASE_SHA="${{ github.event.before }}"
+          else
+            BASE_SHA="${{ github.event.pull_request.base.sha }}"
+          fi
+          CHANGED=$(git diff --name-only "$BASE_SHA" "${{ github.sha }}" 2>/dev/null || echo "")
+          echo "psdocs=$(echo "$CHANGED" | grep -qE '^(packages/psdocs/|build/)' && echo true || echo false)" >> $GITHUB_OUTPUT
+          echo "psdocs-azure=$(echo "$CHANGED" | grep -qE '^(packages/psdocs-azure/|packages/psdocs/|build/)' && echo true || echo false)" >> $GITHUB_OUTPUT
+          echo "vscode=$(echo "$CHANGED" | grep -qE '^packages/vscode-extension/' && echo true || echo false)" >> $GITHUB_OUTPUT
 
   build-psdocs:
     needs: changes