Refactor random generation into a definition to make it reusable

Signed-off-by: Tom Chauveau <tom.chauveau@epitech.eu>

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

@@ -9,8 +9,10 @@ import (
 TestConfig: gcpConfig: gcp.#Config
 
 TestGCR: {
+	random: #Random & {}
+
 	repository: "gcr.io/dagger-ci/test"
-	tag:        "test-gcr-\(random)"
+	tag:        "test-gcr-\(random.out)"
 
 	creds: gcr.#Credentials & {
 		config: TestConfig.gcpConfig
@@ -23,7 +25,7 @@ TestGCR: {
 			op.#DockerBuild & {
 				dockerfile: """
 				FROM alpine
-				RUN echo \(random) > /test
+				RUN echo \(random.out) > /test
 				"""
 			},
 
@@ -59,7 +61,7 @@ TestGCR: {
 		op.#Exec & {
 			always: true
 			args: [
-				"sh", "-c", "test $(cat test) = \(random)",
+				"sh", "-c", "test $(cat test) = \(random.out)",
 			]
 		},
 	]
@@ -74,7 +76,7 @@ TestGCR: {
 		op.#DockerBuild & {
 			dockerfile: #"""
 				FROM \#(push.ref)
-				RUN test $(cat test) = \#(random)
+				RUN test $(cat test) = \#(random.out)
 			"""#
 		},
 	]

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

@@ -1,20 +1,33 @@
 package gcr
 
 import (
+	"strconv"
+
 	"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"
-		},
-	]
+#Random: {
+	size: *12 | number
+
+	out: {
+		string
+
+		#up: [
+			op.#Load & {from: alpine.#Image},
+
+			op.#Exec & {
+				always: true
+				args: ["sh", "-c", #"""
+					tr -cd '[:alpha:]' < /dev/urandom | fold -w "$SIZE" | head -n 1 | tr '[A-Z]' '[a-z]' | tr -d '\n' > /rand
+					"""#,
+				]
+				env: SIZE: strconv.FormatInt(size, 10)
+			},
+
+			op.#Export & {
+				source: "/rand"
+			},
+		]
+	}
 }