stdlib: update gcp to use secrets

Signed-off-by: Andrea Luzzardi <aluzzardi@gmail.com>

tests/stdlib/gcp/gcr/.dagger/env/default/plan/random.cue

@@ -0,0 +1,20 @@
+package gcr
+
+import (
+	"dagger.io/alpine"
+	"dagger.io/dagger/op"
+)
+
+// Generate a random number
+random: {
+	string
+	#up: [
+		op.#Load & {from: alpine.#Image},
+		op.#Exec & {
+			args: ["sh", "-c", "cat /dev/urandom | tr -dc 'a-z' | fold -w 10 | head -n 1 | tr -d '\n' > /rand"]
+		},
+		op.#Export & {
+			source: "/rand"
+		},
+	]
+}