fix: make diagnostic artifact names unique per step

Every job in a run uploaded capa_artifacts-<run id>, so only the first
upload succeeded. Add the run attempt, job and step IDs.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/instrumentation.ts

@@ -41,10 +41,26 @@ export class Artifacts {
   ) {}
 
   /** Upload artifacts to GitHub Actions via [@actions/artifact]. */
+  /**
+   * Artifact name, unique per action step in a workflow run.
+   *
+   * Artifact names must be unique within a run, and every job (or step) using
+   * the action uploads one, so include the attempt, job and step IDs.
+   */
+  get name(): string {
+    const parts = [
+      this.runId,
+      process.env.GITHUB_RUN_ATTEMPT,
+      process.env.GITHUB_JOB,
+      process.env.GITHUB_ACTION,
+    ].filter((part) => part !== undefined && part !== "");
+    return ["capa_artifacts", ...parts].join("-");
+  }
+
   async upload(): Promise<string> {
     const client = new DefaultArtifactClient();
     await client.uploadArtifact(
-      "capa_artifacts-" + this.runId,
+      this.name,
       this.artifactFilenames
         .map((filename) => path.join(this.dir, filename))
         .filter((filepath) => fs.existsSync(filepath)),

test/instrumentation.test.ts

@@ -42,6 +42,18 @@ describe("instrumentation", () => {
       const artifacts = new Artifacts(dir, ARTIFACT_FILENAMES, debug);
       expect(artifacts.runId).toMatch(/^ghrunid-notfound-/);
     });
+
+    it("name in a workflow step includes attempt, job and step", () => {
+      vi.stubEnv("GITHUB_RUN_ATTEMPT", "2");
+      vi.stubEnv("GITHUB_JOB", "list_versions");
+      vi.stubEnv("GITHUB_ACTION", "execute");
+
+      const artifacts = new Artifacts("/dir", ARTIFACT_FILENAMES, false, "123");
+
+      expect(artifacts.name).toBe(
+        "capa_artifacts-123-2-list_versions-execute",
+      );
+    });
   });
 
   describe("Instruments", () => {