Merge pull request #1842 from helderco/docker-load

Add export and load for dagger images

docs/drafts/1216-engine-load.md

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+---
+slug: /1216/engine-load
+displayed_sidebar: europa
+---
+
+# Loading a dagger image into a docker daemon
+
+Using `docker.#Load`, you can save a dagger image (`docker.#Image`) into a local or remote engine.
+
+It can be useful to debug or test a build locally before pushing.
+
+## Local daemon
+
+```cue file=./plans/local.cue
+```
+
+## Remote daemon, via SSH
+
+```cue file=./plans/ssh.cue
+```

docs/drafts/plans/local.cue

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+package main
+
+import (
+	"dagger.io/dagger"
+	"universe.dagger.io/docker"
+)
+
+dagger.#Plan & {
+	client: filesystem: "/var/run/docker.sock": read: contents: dagger.#Service
+
+	actions: {
+		build: docker.#Build & {
+			...
+		}
+
+		load: docker.#Load & {
+			image: build.output
+			host:  client.filesystem."/var/run/docker.sock".read.contents
+			tag:   "myimage"
+		}
+	}
+}

docs/drafts/plans/ssh.cue

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+package main
+
+import (
+	"dagger.io/dagger"
+	"universe.dagger.io/docker"
+)
+
+dagger.#Plan & {
+	client: filesystem: {
+		"/home/user/.ssh/id_rsa": read: contents:      dagger.#Secret
+		"/home/user/.ssh/known_hosts": read: contents: dagger.#Secret
+	}
+
+	actions: {
+		build: docker.#Build & {
+			...
+		}
+
+		load: docker.#Load & {
+			image: build.output
+			tag:   "myimage:v2"
+			host:  "ssh://root@93.184.216.34"
+			ssh: {
+				key:        client.filesystem."/home/user/.ssh/id_rsa".read.contents
+				knownHosts: client.filesystem."/home/user/.ssh/known_hosts".read.contents
+			}
+		}
+	}
+}