Add max-parallel support for matrix strategy

src/__snapshots__/workflow.spec.ts.snap

@@ -28,6 +28,30 @@ jobs:
 "
 `;
 
+exports[`Workflow > allows a job matrix with max-parallel 1`] = `
+"# Workflow automatically generated by gat
+# DO NOT CHANGE THIS FILE MANUALLY
+
+name: Matrix with max parallel
+on:
+  push: null
+jobs:
+  job1:
+    runs-on: ubuntu-22.04
+    timeout-minutes: 15
+    strategy:
+      fail-fast: false
+      max-parallel: 2
+      matrix:
+        food:
+          - 🍕
+          - 🍔
+          - 🌮
+    steps:
+      - run: echo \${{ matrix.food }}
+"
+`;
+
 exports[`Workflow > allows concurrency groups at workflow level 1`] = `
 "# Workflow automatically generated by gat
 # DO NOT CHANGE THIS FILE MANUALLY

src/job.ts

@@ -6,6 +6,7 @@ export type ConcurrencyGroup = {
 export interface Matrix {
   elements: Array<{ id: string; options: Array<string | number | boolean> }>;
   extra?: Array<Record<string, string | number | boolean>>;
+  maxParallel?: number;
 }
 
 export interface Service {

src/workflow.spec.ts

@@ -135,6 +135,27 @@ describe("Workflow", () => {
     expect(await workflow.compile()).toMatchSnapshot();
   });
 
+  it("allows a job matrix with max-parallel", async () => {
+    const workflow = new Workflow("Matrix with max parallel");
+    workflow.on("push").addJob("job1", {
+      matrix: {
+        elements: [
+          {
+            id: "food",
+            options: ["🍕", "🍔", "🌮"],
+          },
+        ],
+        maxParallel: 2,
+      },
+      steps: [
+        {
+          run: "echo ${{ matrix.food }}",
+        },
+      ],
+    });
+    expect(await workflow.compile()).toMatchSnapshot();
+  });
+
   it("allows uses steps", async () => {
     const workflow = new Workflow("Uses steps");
     workflow

src/workflow.ts

@@ -182,6 +182,10 @@ export class Workflow<
                 strategy: matrix
                   ? {
                       "fail-fast": false,
+                      "max-parallel":
+                        typeof matrix !== "string" && matrix.maxParallel != null
+                          ? matrix.maxParallel
+                          : undefined,
                       matrix:
                         typeof matrix === "string"
                           ? matrix