refactor: move things to packages (#39)

internal/forge/gitlab/gitlab.go

@@ -0,0 +1,31 @@
+package gitlab
+
+import (
+	"fmt"
+
+	"github.com/apricote/releaser-pleaser/internal/forge"
+)
+
+// var _ forge.Forge = &GitLab{}
+
+type GitLab struct {
+	options forge.Options
+}
+
+func (g *GitLab) autodiscover() {
+	// Read settings from GitLab-CI env vars
+}
+
+func New(options forge.Options) *GitLab {
+	gl := &GitLab{
+		options: options,
+	}
+
+	gl.autodiscover()
+
+	return gl
+}
+
+func (g *GitLab) RepoURL() string {
+	return fmt.Sprintf("https://gitlab.com/%s", g.options.Repository)
+}