📌 make: Pin golangci-lint version (#29)

Pin golangci-lint version to exact given version number and don't just
ensure it is at or above a minimum version number. We've had cases
where new golangci-lint versions listed errors that older ones didn't.

Rather than using docker use go get to install correct version as
{GOBIN}/golangci-lint-vX.Y.Z.

Thanks @camh- for doing all the work and letting me take credit.

This merges the following commits:

• make: Pin golangci-lint version

  Makefile | 22 ++++++++++------------
  1 file changed, 10 insertions(+), 12 deletions(-)

Pull-Request: #29