feat: create golangci-lint setup action

Author: nickhstr

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README.md

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+# action-setup-golangci-lint
+Install [golangci/golangci-lint](https://github.com/golangci/golangci-lint) for workflows.
+
+golangci-lint is downloaded and added to the tools cache for reuse across jobs/steps in a workflow.
+
+## Inputs
+Only one input is needed: `version`. This must be a semantic version, matching a released version of golangci-lint.

action.yml

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+name: 'Setup golangci-lint Action'
+description: 'Downloads and installs the golangci-lint tool'
+branding:
+  icon: check-circle
+  color: green
+inputs:
+  version:
+    required: true
+    description: 'Version of golangci-lint to install'
+runs:
+  using: 'node12'
+  main: 'src/index.js'