Add the golangci-lint GitHub action

Signed-off-by: Richard Wall <richard.wall@venafi.com>

.github/workflows/golangci-lint.yml

@@ -0,0 +1,26 @@
+name: golangci-lint
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+
+permissions:
+  contents: read
+
+jobs:
+  golangci:
+    name: lint
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-go@v4
+        with:
+          go-version-file: go.mod
+          # setup-go v4 uses cache automatically, which conflicts with golangci-lint's cache.
+          # See https://github.com/golangci/golangci-lint-action/pull/704
+          cache: false
+      - uses: golangci/golangci-lint-action@v3
+        with:
+          version: v1.55.2
+          args: --timeout=30m --config=.golangci.ci.yaml