Work in progress: develop dagger with dagger

Signed-off-by: Solomon Hykes <sh.github.6811@hykes.org>

docker.cue

@@ -0,0 +1,119 @@
+package main
+
+import (
+	"dagger.io/dagger"
+	"dagger.io/llb"
+)
+
+#ImageFromSource: {
+	source: dagger.#Artifact
+
+	#up: [
+		llb.#DockerBuild & {
+			context: source
+		},
+	]
+}
+
+#ImageFromRef: {
+	ref: string
+
+	#up: [
+		llb.#FetchContainer & {
+			"ref": ref
+		},
+	]
+}
+
+#ImageFromDockerfile: {
+	dockerfile: string
+	context:    dagger.#Artifact
+
+	#up: [
+		llb.#DockerBuild & {
+			"context":    context
+			"dockerfile": dockerfile
+		},
+	]
+}
+
+#Container: {
+
+	image: dagger.#Artifact
+
+	// Optional setup script
+	setup: string | *null
+
+	// Environment variables shared by all commands
+	env: [string]: string
+
+	volume: [name=string]: {
+		dest: string | *"/"
+		*{
+			type:   "mount"
+			from:   dagger.#Artifact
+			source: string | *"/"
+		} | {
+			type:   "copy"
+			from:   dagger.#Artifact
+			source: string | *"/"
+		} | {
+			type: "tmpfs" | "cache"
+		}
+	}
+
+	command: [name=string]: {
+		args: [...string]
+		dir:   string | *"/"
+		"env": env & {
+			[string]: string
+		}
+		outputDir: string | *"/"
+		always:    true | *false
+
+		// Execute each command in a pristine filesystem state
+		// (commands do not interfere with each other's changes)
+		#up: [
+			llb.#Load & {from: image},
+			// Copy volumes with type=copy
+			for _, v in volume if v.type == "copy" {
+				llb.#Copy & {
+					from: v.from
+					dest: v.dest
+					src:  v.source
+				}
+			},
+			// Execute setup script
+			if setup != null {
+				llb.#Exec & {
+					"env": env
+					args: ["/bin/sh", "-c", setup]
+				}
+			},
+			llb.#Exec & {
+				"args":   args
+				"env":    env
+				"dir":    dir
+				"always": always
+				mount: {
+					for _, v in volume if v.type == "cache" {
+						"\(v.dest)": "cache"
+					}
+					for _, v in volume if v.type == "tmpfs" {
+						"\(v.dest)": "tmpfs"
+					}
+					for _, v in volume if v.type == "mount" {
+						"\(v.dest)": {
+							from: v.from
+							path: v.source
+						}
+					}
+				}
+			},
+			llb.#Subdir & {
+				dir: outputDir
+			},
+		]
+	}
+
+}