Installation in a restricted CI environment

[kishaningithub]

Problem 1

In restricted go ci agents i often find that access to install.goreleaser.com is blocked where as raw.githubusercontent.com is not.

Proposed solution

If install script file is checked in as part of the repo it can be retrived via raw.githubusercontent.com. Currently dep project has an install.sh file enabling it to be "curled" from raw.githubusercontent.com

Installation from install.goreleaser.com can still and always remain the primary mode of installation and raw.githubusercontent.com can be a backup

Problem 2

In readme

curl -sfL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh | bash -s -- -b $GOPATH/bin vX.Y.Z

In alpine linux boxes bash will not be present

Proposed solution

Replace the installation script in read me as

curl -sfL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh | sh

If you are fine with this i will submit a PR 🙂