[node operator] self-initialize resources

Signed-off-by: Malte Poll <mp@edgeless.systems>

operators/constellation-node-operator/internal/gcp/client/config.go

@@ -0,0 +1,24 @@
+package client
+
+import (
+	"errors"
+	"regexp"
+
+	"github.com/spf13/afero"
+)
+
+var projectIDRegex = regexp.MustCompile(`(?m)^project-id = (.*)$`)
+
+// loadProjectID loads the project id from the gce config file.
+func loadProjectID(fs afero.Fs, path string) (string, error) {
+	rawConfig, err := afero.ReadFile(fs, path)
+	if err != nil {
+		return "", err
+	}
+	// find project-id line
+	matches := projectIDRegex.FindStringSubmatch(string(rawConfig))
+	if len(matches) != 2 {
+		return "", errors.New("invalid config: project-id not found")
+	}
+	return matches[1], nil
+}