feat: Use GitLab Direct Asset Links (#2219)

* feat: Use GitLab Direct Asset Links

Implement the use of Direct Asset Links when uploading artifacts to a GitLab release

* fix: Remove ArtifactUploadHash

As GitLab support for direct asset linking exists, remove ArtifactUploadHash due to it no longer being required

* test: fix unit tests for gitlab urls

* fix: Use artifact name during GitLab upload

file.Name() included the path to the file, which isn't needed and breaks other areas such as homebrew releases

* docs: Require GitLab version v12.9+

Due to newly introduced dependency on direct asset linking

internal/tmpl/tmpl.go

@@ -55,9 +55,6 @@ const (
 	artifactName = "ArtifactName"
 	artifactPath = "ArtifactPath"
 
-	// gitlab only.
-	artifactUploadHash = "ArtifactUploadHash"
-
 	// build keys.
 	name   = "Name"
 	ext    = "Ext"
@@ -135,11 +132,6 @@ func (t *Template) WithArtifact(a *artifact.Artifact, replacements map[string]st
 	t.fields[binary] = bin.(string)
 	t.fields[artifactName] = a.Name
 	t.fields[artifactPath] = a.Path
-	if val, ok := a.Extra["ArtifactUploadHash"]; ok {
-		t.fields[artifactUploadHash] = val
-	} else {
-		t.fields[artifactUploadHash] = ""
-	}
 	return t
 }
 

internal/tmpl/tmpl_test.go

@@ -47,7 +47,6 @@ func TestWithArtifact(t *testing.T) {
 		"shortcommit":                      "{{.ShortCommit}}",
 		"binary":                           "{{.Binary}}",
 		"proj":                             "{{.ProjectName}}",
-		"":                                 "{{.ArtifactUploadHash}}",
 		"github.com/goreleaser/goreleaser": "{{ .ModulePath }}",
 	} {
 		tmpl := tmpl
@@ -72,24 +71,6 @@ func TestWithArtifact(t *testing.T) {
 		})
 	}
 
-	t.Run("artifact with gitlab ArtifactUploadHash", func(t *testing.T) {
-		t.Parallel()
-		uploadHash := "820ead5d9d2266c728dce6d4d55b6460"
-		result, err := New(ctx).WithArtifact(
-			&artifact.Artifact{
-				Name:   "another-binary",
-				Goarch: "amd64",
-				Goos:   "linux",
-				Goarm:  "6",
-				Extra: map[string]interface{}{
-					"ArtifactUploadHash": uploadHash,
-				},
-			}, map[string]string{},
-		).Apply("{{ .ArtifactUploadHash }}")
-		require.NoError(t, err)
-		require.Equal(t, uploadHash, result)
-	})
-
 	t.Run("artifact without binary name", func(t *testing.T) {
 		t.Parallel()
 		result, err := New(ctx).WithArtifact(