stdlib: docker: support running containers on the local docker engine

Depends on #570

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

tests/stdlib/docker/run/ssh/.dagger/env/default/plan/random.cue

@@ -0,0 +1,33 @@
+package docker
+
+import (
+	"strconv"
+
+	"dagger.io/alpine"
+	"dagger.io/dagger/op"
+)
+
+#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"
+			},
+		]
+	}
+}

tests/stdlib/docker/run/ssh/.dagger/env/default/plan/simple.cue

@@ -0,0 +1,29 @@
+package docker
+
+import (
+	"dagger.io/docker"
+	"dagger.io/dagger"
+)
+
+testConfig: {
+	host: string         @dagger(input)
+	user: string         @dagger(input)
+	key:  dagger.#Secret @dagger(input)
+}
+
+key: dagger.#Secret @dagger(input)
+
+TestSSH: {
+	random: #Random & {}
+
+	run: docker.#Run & {
+		name: "daggerci-test-simple-\(random.out)"
+		ref:  "hello-world"
+
+		ssh: {
+			host: testConfig.host
+			user: testConfig.user
+			key:  testConfig.key
+		}
+	}
+}