Add actions-build job to CI workflow

- Added new actions-build job that depends on lint
- Job builds and validates all custom actions in CI
- Added actions/** to pull_request paths to trigger CI on action changes
- Ensures actions compile correctly before merging

Co-authored-by: pelikhan <4175913+pelikhan@users.noreply.github.com>

Author: Copilot

.github/workflows/ci.yml

@@ -7,6 +7,7 @@ on:
     paths:
       - '**.go'
       - 'pkg/workflow/**'
+      - 'actions/**'
       - '.github/workflows/ci.yml'
       - '.github/workflows/**/*.md'
   workflow_dispatch:
@@ -285,6 +286,42 @@ jobs:
       - name: Lint error messages
         run: make lint-errors
 
+  actions-build:
+    needs: [lint]
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+    concurrency:
+      group: ci-${{ github.ref }}-actions-build
+      cancel-in-progress: true
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5
+
+      - name: Set up Go
+        id: setup-go
+        uses: actions/setup-go@4dc6199c7b1a012772edbd06daecab0f50c9053c # v6
+        with:
+          go-version-file: go.mod
+          cache: true
+
+      - name: Report Go cache status
+        run: |
+          if [ "${{ steps.setup-go.outputs.cache-hit }}" == "true" ]; then
+            echo "✅ Go cache hit" >> $GITHUB_STEP_SUMMARY
+          else
+            echo "⚠️ Go cache miss" >> $GITHUB_STEP_SUMMARY
+          fi
+
+      - name: Verify dependencies
+        run: go mod verify
+
+      - name: Build actions
+        run: make actions-build
+
+      - name: Validate actions
+        run: make actions-validate
+
   fuzz:
     needs: [test]
     runs-on: ubuntu-latest