added comment about always flag + cue fmt

Signed-off-by: Sam Alba <sam.alba@gmail.com>

tests/compute/success/exec-nocache/main.cue

@@ -1,23 +1,23 @@
 package main
 
 import (
-    "dagger.io/alpine"
-    "dagger.io/dagger/op"
+	"dagger.io/alpine"
+	"dagger.io/dagger/op"
 )
 
 rand: {
-    string
+	string
 
-    #up: [
-        op.#Load & {from: alpine.#Image},
-        op.#Exec & {
-                always: true
-				args: ["sh", "-c", """
-					tr -dc A-Za-z0-9 </dev/urandom | head -c 13 > /id
-					"""]
-        },
-        op.#Export & {source: "/id"},
-    ]
+	#up: [
+		op.#Load & {from: alpine.#Image},
+		op.#Exec & {
+			always: true
+			args: ["sh", "-c", """
+				tr -dc A-Za-z0-9 </dev/urandom | head -c 13 > /id
+				"""]
+		},
+		op.#Export & {source: "/id"},
+	]
 }
 
 // If rand is executed twice, cue won't validate