upd: dependabot for actions

add: lint action

.github/dependabot.yml

@@ -4,3 +4,9 @@ updates:
     directory: "/"
     schedule:
       interval: "daily"
+
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      # Check for updates to GitHub Actions every weekday
+      interval: "daily"

.github/workflows/golangci-lint.yml

@@ -0,0 +1,24 @@
+name: golangci-lint
+on:
+  push:
+    tags: [ "v*" ]
+    branches: [ master ]
+  pull_request:
+    branches: [ "*" ]
+
+jobs:
+  golangci:
+    name: lint
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/setup-go@v2
+        with:
+          stable: true
+          go-version: 1.16.x
+      - uses: actions/checkout@v2
+      - name: golangci-lint
+        uses: golangci/golangci-lint-action@v2
+        with:
+          version: v1.40
+          skip-go-installation: true
+          args: --timeout=5m