chore: Implement joins with golang templates (#6429)

* feat: Implement view for workspace builds to include rbac info

* Removes the need to fetch the workspace to run an rbac check.
* chore: Use workspace build as RBAC object
* chore: Use golang templates instead of sqlc files

coderd/database/sqlxqueries/sqlxqueries.go

@@ -0,0 +1,55 @@
+package sqlxqueries
+
+import (
+	"bytes"
+	"embed"
+	"sync"
+	"text/template"
+
+	"golang.org/x/xerrors"
+)
+
+//go:embed *.gosql
+var sqlxQueries embed.FS
+
+var (
+	// Only parse the queries once.
+	once   sync.Once
+	cached *template.Template
+	//nolint:errname
+	cachedError error
+)
+
+// LoadQueries parses the embedded queries and returns the template.
+// Results are cached.
+func LoadQueries() (*template.Template, error) {
+	once.Do(func() {
+		tpls, err := template.New("").
+			Funcs(template.FuncMap{
+				"int32": func(i int) int32 { return int32(i) },
+			}).ParseFS(sqlxQueries, "*.gosql")
+		if err != nil {
+			cachedError = xerrors.Errorf("developer error parse sqlx queries: %w", err)
+			return
+		}
+		cached = tpls
+	})
+
+	return cached, cachedError
+}
+
+// query executes the named template with the given data and returns the result.
+// The returned query string is SQL.
+func query(name string, data interface{}) (string, error) {
+	tpls, err := LoadQueries()
+	if err != nil {
+		return "", err
+	}
+
+	var out bytes.Buffer
+	err = tpls.ExecuteTemplate(&out, name, data)
+	if err != nil {
+		return "", xerrors.Errorf("execute template %s: %w", name, err)
+	}
+	return out.String(), nil
+}