*: switch to golangci-lint

[vbatts]

Signed-off-by: Vincent Batts vbatts@hashbangbash.com

Fixes #876

Now this doesn't fix lint, but now makes main in a fixable way.

checking lint
specs-go/v1/index.go:24:15: `specificies` is a misspelling of `specifics` (misspell)
        // MediaType specificies the type of this document data structure e.g. `application/vnd.oci.image.index.v1+json`
                     ^
specs-go/v1/manifest.go:23:15: `specificies` is a misspelling of `specifics` (misspell)
        // MediaType specificies the type of this document data structure e.g. `application/vnd.oci.image.manifest.v1+json`
                     ^
schema/schema.go:20: File is not `goimports`-ed (goimports)
        "github.com/opencontainers/image-spec/specs-go/v1"
schema/loader.go:81:20: var-naming: method JsonSource should be JSONSource (revive)
func (l *fsLoader) JsonSource() interface{} { // nolint: golint
                   ^
schema/loader.go:120:20: var-naming: method JsonReference should be JSONReference (revive)
func (l *fsLoader) JsonReference() (gojsonreference.JsonReference, error) { // nolint: golint
                   ^
schema/backwards_compatibility_test.go:24: File is not `goimports`-ed (goimports)
        "github.com/opencontainers/image-spec/specs-go/v1"
schema/spec_test.go:98:7: `TOOD` is a misspelling of `TODO` (misspell)
                        // TOOD(stevvooe): This is nearly useless without file, line no.
                           ^
make: *** [Makefile:97: lint] Error 1

[stevvooe]

Now this doesn't fix lint, but now makes main in a fixable way.

It does now! 😛

[stevvooe]

LGTM

I have commits here, so prefer to have two other LGTMs before merge.

[vbatts]

look at that 🟢 CI!