add golang linter

.github/workflows/linter.yml

@@ -0,0 +1,33 @@
+# Copyright (C) 2023, Ava Labs, Inc. All rights reserved.
+# See the file LICENSE for licensing terms.
+
+name: Run Golang Linter
+
+on:
+  push:
+    branches:
+      - '*'
+
+jobs:
+  lint_test:
+    name: Lint
+    runs-on: ubuntu-20.04
+
+    steps:
+    - name: Checkout repository
+    uses: actions/checkout@v3
+    with:
+      path: awm-relayer
+
+    - name: Setup Go
+    - uses: actions/setup-go@v4
+      with:
+        go-version: '1.20.7'
+        check-latest: true
+
+    - name: golangci-lint
+      uses: golangci/golangci-lint-action@v3
+      with:
+        version: v1.51
+        working-directory: .
+        args: --timeout 10m

.golangci.yml

@@ -0,0 +1,29 @@
+# This file configures github.com/golangci/golangci-lint.
+
+run:
+  timeout: 3m
+  tests: true
+  # skip auto-generated files.
+  skip-files:
+    - ".*mock.*"
+
+issues:
+  # Maximum count of issues with the same text. Set to 0 to disable. Default is 3.
+  max-same-issues: 0
+
+linters:
+  disable-all: true
+  enable:
+    - goconst
+    - goimports
+    - gosimple
+    - govet
+    - ineffassign
+    - misspell
+    - unconvert
+    - unused
+    - whitespace
+
+linters-settings:
+  gofmt:
+    simplify: true