Add do tests

Signed-off-by: Joel Longtine <joel@dagger.io>

tests/plan/do/disconnected_outputs_weirdness.cue

@@ -0,0 +1,57 @@
+package main
+
+import (
+	"dagger.io/dagger"
+
+	"universe.dagger.io/alpine"
+	"universe.dagger.io/bash"
+)
+
+dagger.#Plan & {
+	// This is acting weird... 
+	// I don't understand why `cue/flow` thinks that outputs.files.test has a dependency
+	// on actions.fromAndrea.a.export._files."/output.txt"._read
+	// It _does_ fail correctly, FWIW, when it reaches this code. 
+	// TASK: outputs.files.test
+	// DEPENDENCIES:
+	//     actions.fromAndrea.a.export._files."/output.txt"._read
+	//     actions.image._dag."1"._exec
+	//     actions.image._dag."0"._op
+	outputs: files: test: {
+		dest:     "./test_do"
+		contents: actions.test1.one.export.files["/output.txt"]
+	}
+
+	actions: {
+		image: alpine.#Build & {
+			packages: bash: {}
+		}
+
+		abcAction: {
+			a: bash.#Run & {
+				input: image.output
+				script: contents: "echo -n 'from andrea with love' > /output.txt"
+				export: files: "/output.txt": string
+			}
+			b: {
+				x: bash.#Run & {
+					input: image.output
+					script: contents: "echo -n false > /output.txt"
+					export: files: "/output.txt": string
+				}
+				if x.export.files["/output.txt"] == "false" {
+					y: bash.#Run & {
+						input: a.output
+						script: contents: "echo -n hello from y"
+						export: files: "/output.txt": "from andrea with love"
+					}
+				}
+			}
+		}
+
+		notMe: bash.#Run & {
+			input: image.output
+			script: contents: "false"
+		}
+	}
+}

tests/plan/do/do_not_run_unspecified_tasks.cue

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+package main
+
+import (
+	"dagger.io/dagger"
+
+	"universe.dagger.io/alpine"
+	"universe.dagger.io/bash"
+)
+
+dagger.#Plan & {
+	outputs: files: test: {
+		dest:     "./test_do"
+		contents: actions.test.one.export.files["/output.txt"]
+	}
+
+	outputs: files: dependent: {
+		dest:     "./dependent_do"
+		contents: actions.dependent.one.export.files["/output.txt"]
+	}
+
+	actions: {
+		image: alpine.#Build & {
+			packages: bash: {}
+		}
+
+		test: {
+			one: bash.#Run & {
+				input: image.output
+				script: contents: "echo Hello World! > /output.txt"
+				export: files: "/output.txt": string
+			}
+
+			two: bash.#Run & {
+				input: image.output
+				script: contents: "true"
+			}
+
+			three: bash.#Run & {
+				input: image.output
+				script: contents: "cat /one/output.txt"
+				mounts: output: {
+					contents: one.export.rootfs
+					dest:     "/one"
+				}
+			}
+		}
+
+		dependent: {
+			one: bash.#Run & {
+				input: test.one.output
+				script: contents: "cat /output.txt"
+				export: files: "/output.txt": string
+			}
+		}
+
+		notMe: bash.#Run & {
+			input: image.output
+			script: contents: "false"
+		}
+	}
+}

tests/plan/do/dynamic_tasks.cue

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+package main
+
+import (
+	"dagger.io/dagger"
+
+	"universe.dagger.io/alpine"
+	"universe.dagger.io/bash"
+)
+
+dagger.#Plan & {
+	outputs: files: andrea: {
+		dest:     "./andrea_do"
+		contents: actions.test.b.y.export.files["/output.txt"]
+	}
+
+	actions: {
+		image: alpine.#Build & {
+			packages: bash: {}
+		}
+
+		test: {
+			a: bash.#Run & {
+				input: image.output
+				script: contents: "echo -n 'from andrea with love' > /output.txt"
+				export: files: "/output.txt": string
+			}
+			b: {
+				x: bash.#Run & {
+					input: image.output
+					script: contents: "echo -n testing > /output.txt"
+					export: files: "/output.txt": string
+				}
+				// This fails. Building the Actions lookup table breaks
+				if x.export.files["/output.txt"] == "testing" {
+					y: bash.#Run & {
+						input: a.output
+						script: contents: "echo -n hello from y"
+						export: files: "/output.txt": string
+					}
+				}
+			}
+		}
+
+		// notMe: bash.#Run & {
+		//  input: image.output
+		//  script: contents: "false"
+		// }
+	}
+}