feat: Add user roles, but do not yet enforce them (#1200)

* chore: Rework roles to be expandable by name alone

coderd/rbac/builtin_internal_test.go

@@ -0,0 +1,55 @@
+package rbac
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+
+	"github.com/google/uuid"
+)
+
+func TestRoleByName(t *testing.T) {
+	t.Parallel()
+
+	t.Run("BuiltIns", func(t *testing.T) {
+		t.Parallel()
+		testCases := []struct {
+			Role Role
+		}{
+			{Role: builtInRoles[admin]("")},
+			{Role: builtInRoles[member]("")},
+			{Role: builtInRoles[auditor]("")},
+
+			{Role: builtInRoles[orgAdmin](uuid.New().String())},
+			{Role: builtInRoles[orgAdmin](uuid.New().String())},
+			{Role: builtInRoles[orgAdmin](uuid.New().String())},
+
+			{Role: builtInRoles[orgMember](uuid.New().String())},
+			{Role: builtInRoles[orgMember](uuid.New().String())},
+			{Role: builtInRoles[orgMember](uuid.New().String())},
+		}
+
+		for _, c := range testCases {
+			c := c
+			t.Run(c.Role.Name, func(t *testing.T) {
+				role, err := RoleByName(c.Role.Name)
+				require.NoError(t, err, "role exists")
+				require.Equal(t, c.Role, role)
+			})
+		}
+	})
+
+	// nolint:paralleltest
+	t.Run("Errors", func(t *testing.T) {
+		var err error
+
+		_, err = RoleByName("")
+		require.Error(t, err, "empty role")
+
+		_, err = RoleByName("too:many:colons")
+		require.Error(t, err, "too many colons")
+
+		_, err = RoleByName(orgMember)
+		require.Error(t, err, "expect orgID")
+	})
+}