Add PowerShell package (#1783)

Signed-off-by: Chris Hunt <114173+cdhunt@users.noreply.github.com>

pkg/universe.dagger.io/powershell/test/test.cue

@@ -0,0 +1,71 @@
+package powershell
+
+import (
+	"dagger.io/dagger"
+
+	"universe.dagger.io/docker"
+	"universe.dagger.io/powershell"
+)
+
+dagger.#Plan & {
+	actions: test: {
+
+		_pull: docker.#Pull & {
+			source: "mcr.microsoft.com/powershell"
+		}
+		_image: _pull.output
+
+		// Run a script from source directory + filename
+		runFile: {
+
+			dir:   _load.output
+			_load: dagger.#Source & {
+				path: "./data"
+				include: ["*.ps1"]
+			}
+
+			run: powershell.#Run & {
+				input: _image
+				export: files: "/out.txt": _
+				script: {
+					directory: dir
+					filename:  "hello.ps1"
+				}
+			}
+			output: run.export.files."/out.txt" & "Hello world!\n"
+		}
+
+		// Run a script from string
+		runString: {
+			run: powershell.#Run & {
+				input: _image
+				export: files: "/output.txt": _
+				script: contents: "Set-Content -Value 'Hello inline world!' -Path '/output.txt'"
+			}
+			output: run.export.files."/output.txt" & "Hello inline world!\n"
+		}
+
+		// Test args from string
+		runStringArg: {
+			run: powershell.#Run & {
+				input: _image
+				export: files: "/output.txt": _
+				script: contents: "Set-Content -Value 'Hello arg world!' -Path $($args[0])"
+				args: ["/output.txt"]
+			}
+			output: run.export.files."/output.txt" & "Hello arg world!\n"
+		}
+
+		// Test 2 args from string
+		runString2Arg: {
+			run: powershell.#Run & {
+				input: _image
+				export: files: "/output.txt": _
+				script: contents: "Set-Content -Value \"Hello args $($args[0])\" -Path $($args[1])"
+				args: ["world!", "/output.txt"]
+			}
+			output: run.export.files."/output.txt" & "Hello args world!\n"
+		}
+
+	}
+}