bash.#Run: new and improved

* Script is written to filesystem, not inlined as argument
* Pass script either as string, or directory+filename

Signed-off-by: Solomon Hykes <solomon@dagger.io>

pkg/universe.dagger.io/bash/test/bash.bats

@@ -0,0 +1,10 @@
+setup() {
+    load '../../bats_helpers'
+
+    common_setup
+}
+
+@test "bash.#Run" {
+    dagger up ./run-simple
+}
+

pkg/universe.dagger.io/bash/test/run-simple/hello.sh

@@ -0,0 +1,3 @@
+#!/bin/sh
+
+echo Hello, world > /out.txt

pkg/universe.dagger.io/bash/test/run-simple/simple.cue

@@ -0,0 +1,87 @@
+package bash
+
+import (
+	"dagger.io/dagger"
+
+	"universe.dagger.io/docker"
+	"universe.dagger.io/alpine"
+)
+
+dagger.#DAG & {
+	actions: {
+		"Run from source directory": {
+			build: alpine.#Build & {
+				packages: bash: _
+			}
+			run: #Run & {
+				image: build.output
+				script: {
+					directory: loadScripts.output
+					filename:  "hello.sh"
+				}
+				export: files: "/out.txt": _
+			}
+			output: run.export.files."/out.txt".contents & "Hello, world\n"
+		}
+
+		"Run from source directory with custom image": {
+			debian: docker.#Pull & {
+				source: "index.docker.io/debian"
+			}
+			run: #Run & {
+				image: debian.output
+				export: files: "/out.txt": _
+				script: {
+					directory: loadScripts.output
+					filename:  "hello.sh"
+				}
+			}
+			output: run.export.files."/out.txt".contents & "Hello, world\n"
+		}
+
+		"Run from string": {
+			run: #Run & {
+				script: contents: "echo 'Hello, inlined world!' > /output.txt"
+				export: files: "/output.txt": _
+			}
+			output: run.export.files."/output.txt".contents & "Hello, inlined world!\n"
+		}
+
+		"Run from string with custom image": {
+			debian: docker.#Pull & {
+				source: "index.docker.io/debian"
+			}
+			run: #Run & {
+				image: debian.output
+				export: files: "/output.txt": _
+				script: contents: "echo 'Hello, inlined world!' > /output.txt"
+			}
+			output: run.export.files."/output.txt".contents & "Hello, inlined world!\n"
+		}
+
+		// Same thing but without bash.#Run
+		control: {
+			run: docker.#Run & {
+				image: base.output
+				command: {
+					name: "sh"
+					args: ["/bash/scripts/hello.sh"]
+				}
+				mounts: scripts: {
+					contents: loadScripts.output
+					dest:     "/bash/scripts"
+				}
+				export: files: "/out.txt": _
+			}
+			output: run.export.files."/out.txt".contents & "Hello, world\n"
+			base:   docker.#Pull & {
+				source: "alpine"
+			}
+		}
+
+		loadScripts: dagger.#Source & {
+			path: "."
+			include: ["*.sh"]
+		}
+	}
+}