cue modules: move stdlib to pkg/alpha.dagger.io

In preparation for Europa, we will vendor multiple CUE modules:

- `pkg/alpha.dagger.io`: legacy non-europa packages
- `pkg/dagger.io`: core Europa packages
- `pkg/universe.dagger.io`: Europa universe

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

pkg/alpha.dagger.io/aws/elb/elb.cue

@@ -0,0 +1,85 @@
+// AWS Elastic Load Balancer (ELBv2)
+package elb
+
+import (
+	"alpha.dagger.io/dagger/op"
+	"alpha.dagger.io/aws"
+)
+
+// Returns an unused rule priority (randomized in available range)
+#RandomRulePriority: {
+
+	// AWS Config
+	config: aws.#Config
+
+	// ListenerArn
+	listenerArn: string @dagger(input)
+
+	// Optional vhost for reusing priorities
+	vhost?: string @dagger(input)
+
+	// exported priority
+	priority: out @dagger(output)
+
+	out: {
+		string
+
+		#up: [
+			op.#Load & {
+				from: aws.#CLI & {
+					"config": config
+				}
+			},
+
+			op.#Exec & {
+				args: [
+					"/bin/bash",
+					"--noprofile",
+					"--norc",
+					"-eo",
+					"pipefail",
+					#"""
+						if [ -s "$VHOST" ]; then
+							# We passed a vhost as input, try to recycle priority from previously allocated vhost
+							priority=$(aws elbv2 describe-rules \
+								--listener-arn "$LISTENER_ARN" | \
+								jq -r --arg vhost "$VHOST" '.Rules[] | select(.Conditions[].HostHeaderConfig.Values[] == $VHOST) | .Priority')
+						
+							if [ -n "${priority}" ]; then
+								echo -n "${priority}" > /priority
+								exit 0
+							fi
+						fi
+
+						# Grab a priority random from 1-50k and check if available, retry 10 times if none available
+						priority=0
+						for i in {1..10}
+						do
+							p=$(shuf -i 1-50000 -n 1)
+							# Find the next priority available that we can allocate
+							aws elbv2 describe-rules \
+								--listener-arn "$LISTENER_ARN" \
+								| jq -e "select(.Rules[].Priority == \"${p}\") | true" && continue
+							priority="${p}"
+							break
+						done
+						if [ "${priority}" -lt 1 ]; then
+							echo "Error: cannot determine a Rule priority"
+							exit 1
+						fi
+						echo -n "${priority}" > /priority
+						"""#,
+				]
+				env: {
+					LISTENER_ARN: listenerArn
+					VHOST:        vhost
+				}
+			},
+
+			op.#Export & {
+				source: "/db_created"
+				format: "string"
+			},
+		]
+	}
+}