Add new Client API

Signed-off-by: Helder Correia <174525+helderco@users.noreply.github.com>

tests/plan/client/filesystem/write/test.cue

@@ -0,0 +1,69 @@
+package main
+
+import (
+	"dagger.io/dagger"
+)
+
+dagger.#Plan & {
+	client: filesystem: {
+		out_fs: write: contents:               actions.test.fs.data.output
+		"out_files/test.txt": write: contents: actions.test.file.data.contents
+		"out_files/secret.txt": write: {
+			contents:    actions.test.secret.data.output
+			permissions: 0o600
+		}
+	}
+
+	actions: {
+		image: dagger.#Pull & {
+			source: "alpine:3.15.0@sha256:e7d88de73db3d3fd9b2d63aa7f447a10fd0220b7cbf39803c803f2af9ba256b3"
+		}
+		test: {
+			fs: {
+				data: dagger.#WriteFile & {
+					input:    dagger.#Scratch
+					path:     "/test"
+					contents: "foobar"
+				}
+				// FIXME: hack until we can do outputs with `dagger do`
+				verify: dagger.#ReadFile & {
+					input: client.filesystem."out_fs".write.contents
+					path:  "test"
+				}
+			}
+			file: {
+				// Only using contents for reference in client
+				data: dagger.#WriteFile & {
+					input:    dagger.#Scratch
+					path:     "/test"
+					contents: "foobaz"
+				}
+				// FIXME: hack until we can do outputs with `dagger do`
+				verify: dagger.#Exec & {
+					input: image.output
+					args: ["echo", "-c", client.filesystem."out_files/test.txt".write.contents]
+				}
+			}
+			secret: {
+				create: dagger.#WriteFile & {
+					input:    dagger.#Scratch
+					path:     "/test"
+					contents: "foo-barab-oof"
+				}
+				data: dagger.#NewSecret & {
+					input: create.output
+					path:  "/test"
+				}
+				// FIXME: hack until we can do outputs with `dagger do`
+				verify: dagger.#Exec & {
+					input: image.output
+					mounts: secret: {
+						dest:     "/run/secrets/test"
+						contents: client.filesystem."out_files/secret.txt".write.contents
+					}
+					args: ["id"]
+				}
+			}
+		}
+	}
+}