ci: enable golangci-lint

Signed-off-by: Ramkumar Chinchani <rchincha.dev@gmail.com>

Author: rchincha

.github/workflows/golangci-lint.yaml

@@ -0,0 +1,50 @@
+name: golangci-lint
+on:
+  push:
+    tags:
+      - v*
+    branches:
+      - main
+  pull_request:
+permissions:
+  contents: read
+  # Optional: allow read access to pull request. Use with `only-new-issues` option.
+  # pull-requests: read
+jobs:
+  golangci:
+    name: lint
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/setup-go@v5
+        with:
+          cache: false
+          go-version: '1.23'
+      - uses: actions/checkout@v4
+      - name: Run linter with GH action
+        uses: golangci/golangci-lint-action@v6
+        with:
+          # Optional: version of golangci-lint to use in form of v1.2 or v1.2.3 or `latest` to use the latest version
+          version: v1.64.8
+
+          # Optional: working directory, useful for monorepos
+          # working-directory: somedir
+
+          # Optional: golangci-lint command line arguments.
+          # args: --issues-exit-code=0
+          args: --config ./golangcilint.yaml --exclude-files ./pkg/verity/verity.go --enable-all ./cmd/... ./pkg/...
+
+          # Optional: show only new issues if it's a pull request. The default value is `false`.
+          # only-new-issues: true
+
+          # Optional: if set to true then the action don't cache or restore ~/go/pkg.
+          # skip-pkg-cache: true
+          # skip-pkg-cache: false
+
+          # Optional: if set to true then the action don't cache or restore ~/.cache/go-build.
+          # skip-build-cache: true
+      - name: Run linter from make target
+        run: |
+          make check
+      - name: Run log linter
+        run: |
+          make check-logs

golangcilint.yaml

@@ -0,0 +1,75 @@
+run:
+  timeout: 60m
+
+linters:
+  enable-all: true
+  disable:
+    - gomnd
+    - funlen
+    - gocognit
+    - paralleltest
+    - forbidigo
+    - ireturn
+    - wrapcheck
+    - exhaustive
+    - maintidx
+    - exhaustruct
+    - rowserrcheck
+    - sqlclosecheck
+    - revive
+    - musttag
+    - depguard
+    - execinquery
+    - inamedparam
+    - intrange
+    - promlinter
+    - protogetter
+    - contextcheck # needs to revisit: https://github.com/project-zot/zot/pull/2556
+    - copyloopvar # needs to revisit: https://github.com/project-zot/zot/pull/2556
+    - typecheck
+    - exportloopref
+
+linters-settings:
+  dupl:
+    threshold: 200
+  nestif:
+    min-complexity: 26
+  cyclop:
+    max-complexity: 40
+    skip-tests: true
+  varnamelen:
+    check-return: true
+    ignore-type-assert-ok: true
+    ignore-map-index-ok: true
+    ignore-chan-recv-ok: true
+    ignore-names:
+      - err
+      - ok
+      - gc
+      - wg
+    ignore-decls:
+      - n int
+      - i int
+      - r *os.File
+      - w *os.File
+      - to int64
+  gci:
+    sections:
+      - standard
+      - default
+  wsl:
+    allow-assign-and-anything: true
+    force-err-cuddling: true
+  nolintlint:
+    allow-unused: true
+  mnd:
+    checks:
+      - argument
+      - case
+      - condition
+      - operation
+      - return
+      - assign
+    ignored-numbers:
+      - "10"
+      - "64"