update action to dagger 0.2

- Remove AGE key setup
- Update README to use `dagger do`
- Update tests to dagger 0.2

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

test/cue.mod/pkg/universe.dagger.io/yarn/yarn.cue

@@ -0,0 +1,144 @@
+// Yarn is a package manager for Javascript applications
+package yarn
+
+import (
+	"strings"
+
+	"dagger.io/dagger"
+
+	"universe.dagger.io/alpine"
+	"universe.dagger.io/bash"
+	"universe.dagger.io/docker"
+)
+
+#Build: #Run & {
+	buildDir: *"build" | string
+	script:   *"build" | string
+}
+
+// Run a Yarn command
+#Run: {
+	// Custom name for this command.
+	// Assign an app-specific name if there are multiple apps in the same plan.
+	name: string | *""
+
+	// App source code
+	source: dagger.#FS
+
+	// Working directory to use
+	cwd: *"." | string
+
+	// Write the contents of `environment` to this file, in the "envfile" format
+	writeEnvFile: string | *""
+
+	// Optional: Read build output from this directory
+	// Must be relative to working directory, cwd
+	buildDir?: string
+
+	// Yarn script to run for this command.
+	script: string
+
+	// Fix for shadowing issues
+	let yarnScript = script
+
+	// Optional arguments for the script
+	args: [...string] | *[]
+
+	// Secret variables
+	// FIXME: not implemented. Are they needed?
+	secrets: [string]: dagger.#Secret
+
+	container: #input: docker.#Image | *{
+		// FIXME: Yarn's version depends on Alpine's version
+		// Yarn version
+		// yarnVersion: *"=~1.22" | string
+		// FIXME: custom base image not supported
+		alpine.#Build & {
+			packages: {
+				bash: {}
+				yarn: {}
+			}
+		}
+	}
+
+	_run: docker.#Build & {
+		steps: [
+			container.#input,
+
+			docker.#Copy & {
+				dest:     "/src"
+				contents: source
+			},
+
+			bash.#Run & {
+				// FIXME: move shell script to its own file
+				script: contents: #"""
+					yarn --cwd "$YARN_CWD" install --production false
+					"""#
+
+				mounts: "yarn cache": {
+					dest:     "/cache/yarn"
+					contents: dagger.#CacheDir & {
+						// FIXME: are there character limitations in cache ID?
+						id: "universe.dagger.io/yarn.#Run \(name)"
+					}
+				}
+
+				env: {
+					YARN_CACHE_FOLDER: "/cache/yarn"
+					YARN_CWD:          cwd
+				}
+
+				workdir: "/src"
+			},
+
+			bash.#Run & {
+				// FIXME: move shell script to its own file
+				script: contents: #"""
+					# Create $ENVFILE_NAME file if set
+					[ -n "$ENVFILE_NAME" ] && echo "$ENVFILE" > "$ENVFILE_NAME"
+
+					opts=( $(echo $YARN_ARGS) )
+					yarn --cwd "$YARN_CWD" run "$YARN_BUILD_SCRIPT" ${opts[@]}
+					if [ ! -z "${YARN_BUILD_DIRECTORY:-}" ]; then
+						mv "$YARN_BUILD_DIRECTORY" /build
+					else
+						mkdir /build
+					fi
+					"""#
+
+				mounts: "yarn cache": {
+					dest:     "/cache/yarn"
+					contents: dagger.#CacheDir & {
+						// FIXME: are there character limitations in cache ID?
+						id: "universe.dagger.io/yarn.#Run \(name)"
+					}
+				}
+
+				env: {
+					YARN_BUILD_SCRIPT: yarnScript
+					YARN_ARGS:         strings.Join(args, "\n")
+					YARN_CACHE_FOLDER: "/cache/yarn"
+					YARN_CWD:          cwd
+					if buildDir != _|_ {
+						YARN_BUILD_DIRECTORY: buildDir
+					}
+					if writeEnvFile != "" {
+						ENVFILE_NAME: writeEnvFile
+						ENVFILE:      strings.Join([ for k, v in env {"\(k)=\(v)"}], "\n")
+					}
+				}
+
+				workdir: "/src"
+			},
+		]
+	}
+
+	// The final contents of the package after run
+	_output: dagger.#Subdir & {
+		input: _run.output.rootfs
+		path:  "/build"
+	}
+
+	output: _output.output
+}