Merge pull request #3457 from kolyshkin/ci-merge-lint-extra

ci/gha: convert lint-extra from a job to a step

.github/workflows/validate.yml

@@ -16,6 +16,8 @@ jobs:
     runs-on: ubuntu-20.04
     steps:
       - uses: actions/checkout@v3
+        with:
+          fetch-depth: 2
       - uses: actions/setup-go@v3
         with:
           go-version: "${{ env.GO_VERSION }}"
@@ -26,28 +28,11 @@ jobs:
       - uses: golangci/golangci-lint-action@v3
         with:
           version: v1.45
-
-  lint-extra:
-    # Extra linters, only checking new code from pull requests.
-    if: github.event_name == 'pull_request'
-    runs-on: ubuntu-20.04
-    permissions:
-      contents: read
-    steps:
-      - uses: actions/checkout@v3
-      - uses: actions/setup-go@v3
-        with:
-          go-version: "${{ env.GO_VERSION }}"
-      - name: install deps
+      # Extra linters, only checking new code from a pull request.
+      - name: lint-extra
+        if: github.event_name == 'pull_request'
         run: |
-          sudo apt -q update
-          sudo apt -q install libseccomp-dev
-      - uses: golangci/golangci-lint-action@v3
-        with:
-          only-new-issues: true
-          args: --config .golangci-extra.yml
-          version: v1.45
-
+          golangci-lint run --config .golangci-extra.yml --new-from-rev=HEAD~1 --out-format=github-actions
 
   compile-buildtags:
     runs-on: ubuntu-20.04