Add github actions to lint

.github/ISSUE_TEMPLATE.md

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+### What happened?
+
+### What did you expect?
+
+### Minimal graphql.schema and models to reproduce
+
+### versions
+ - `go list -m github.com/vektah/gqlparser/v2`?
+ - `go version`?
+
+<!--
+Please make sure you are using github.com/vektah/gqlparser/v2 as the v1 is no longer supported!
+-->
+

.github/PULL_REQUEST_TEMPLATE.md

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+Describe your PR and link to any relevant issues. 
+
+I have:
+ - [ ] Added tests covering the bug / feature 
+ - [ ] Updated any relevant documentation

.github/workflows/lint.yml

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+name: golangci-lint
+on:
+  push:
+    branches:
+    - main
+  pull_request:
+    branches:
+    - main
+env:
+  GOFLAGS: "-trimpath"
+  GO_VERSION: 1.19
+jobs:
+  resolve-modules:
+    name: Resolve Modules
+    #    runs-on: [self-hosted, linux, x64]
+    runs-on: ubuntu-latest
+    outputs:
+      matrix: ${{ steps.set-matrix.outputs.matrix }}
+    steps:
+      - name: Checkout Sources
+        uses: actions/checkout@v2
+      - id: set-matrix
+        run: ./tools/resolve-modules.sh
+  golangci:
+    name: Linter
+    needs: resolve-modules
+    runs-on: ubuntu-latest
+    strategy:
+      matrix: ${{ fromJson(needs.resolve-modules.outputs.matrix) }}
+    steps:
+      - name: Install Go
+        uses: actions/setup-go@v3
+        with:
+          # stable: 'false' # Keep this line to be able to use rc and beta version of Go (ex: 1.18.0-rc1).
+          go-version: ${{ env.GO_VERSION }}
+      - uses: actions/checkout@v2
+      - name: lint
+        uses: golangci/golangci-lint-action@v3.2.0
+        with:
+          version: latest
+          # skip cache because of flaky behaviors
+          skip-build-cache: true
+          skip-pkg-cache: true
+          working-directory: ${{ matrix.workdir }}
+          args: --timeout 5m --issues-exit-code=0
+          # only-new-issues: true #show only new issues if it's a pull request. options working-directory and only-new-issues are incompatible

.golangci.yaml

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+run:
+  timeout: 10m
+linters:
+  disable-all: true
+  enable:
+    - ineffassign
+    - typecheck
+    - varcheck
+    - unused
+    - structcheck
+    - deadcode
+    - gosimple
+    - goimports
+    - errcheck
+    - staticcheck
+    - stylecheck
+    - gosec
+    - asciicheck
+    - bodyclose
+    - exportloopref
+    - rowserrcheck
+    - makezero
+    - durationcheck
+    - prealloc
+    - predeclared
+
+linters-settings:
+  staticcheck:
+    checks: ["S1002","S1004","S1007","S1009","S1010","S1012","S1019","S1020","S1021","S1024","S1030","SA2*","SA3*","SA4009","SA5*","SA6000","SA6001","SA6005", "-SA2002"]
+  stylecheck:
+    checks: ["-ST1003"]
+  gosec:
+    severity: "low"
+    confidence: "low"
+    excludes:
+      - G101
+      - G112
+issues:
+  exclude-rules:
+    - path: _test\.go
+      linters:
+        - errcheck
+        - gosec
+        - rowserrcheck
+        - makezero