feat(run): Support working-directory (#28)

Author: koki-develop

lib/package/step.spec.ts

@@ -20,6 +20,14 @@ describe("stepJSON", () => {
         { kind: "run", name: "test", command: "echo 'Hello, world!'" },
         { name: "test", run: "echo 'Hello, world!'" },
       ],
+      [
+        {
+          kind: "run",
+          workingDirectory: "./foo/bar",
+          command: "echo 'Hello, world!'",
+        },
+        { "working-directory": "./foo/bar", run: "echo 'Hello, world!'" },
+      ],
     ])("stepJSON(%j) -> %j", (input, expected) => {
       expect(stepJSON(input)).toEqual(expected);
     });

lib/package/step.ts

@@ -10,7 +10,7 @@ export type StepBase = {
 export type RunStep = StepBase & {
   kind: "run";
   command: string;
-  // TODO: working-directory
+  workingDirectory?: string;
   // TODO: shell
 };
 
@@ -31,7 +31,13 @@ export function stepJSON(step: Step): Record<string, unknown> {
 
   switch (step.kind) {
     case "run":
-      return { ...base, run: step.command };
+      return {
+        ...base,
+        ...(step.workingDirectory != null && {
+          "working-directory": step.workingDirectory,
+        }),
+        run: step.command,
+      };
     case "uses":
       return {
         ...base,