Add prefix and suffix inputs to wrap comment body

Co-authored-by: marocchino <128431+marocchino@users.noreply.github.com>

__tests__/config.test.ts

@@ -210,4 +210,49 @@ describe("getBody", () => {
     expect(await config.getBody()).toBe("")
     expect(core.setFailed).toHaveBeenCalledWith("glob error")
   })
+
+  test("wraps message with prefix and suffix", async () => {
+    const {config, core} = await loadConfig()
+    vi.mocked(core.getInput).mockImplementation(name => {
+      if (name === "message") return "hello there"
+      if (name === "prefix") return "```"
+      if (name === "suffix") return "```"
+      return ""
+    })
+    expect(await config.getBody()).toBe("```\nhello there\n```")
+  })
+
+  test("wraps file content with prefix and suffix", async () => {
+    const {config, core} = await loadConfig()
+    vi.mocked(core.getMultilineInput).mockReturnValue(["__tests__/assets/result"])
+    vi.mocked(core.getInput).mockImplementation(name => {
+      if (name === "prefix") return "```"
+      if (name === "suffix") return "```"
+      return ""
+    })
+    mockGlobCreate.mockResolvedValue({
+      glob: vi.fn().mockResolvedValue([resolve("__tests__/assets/result")]),
+    })
+    expect(await config.getBody()).toBe("```\nhi there\n\n```")
+  })
+
+  test("applies only prefix when suffix is not provided", async () => {
+    const {config, core} = await loadConfig()
+    vi.mocked(core.getInput).mockImplementation(name => {
+      if (name === "message") return "hello there"
+      if (name === "prefix") return "```"
+      return ""
+    })
+    expect(await config.getBody()).toBe("```\nhello there")
+  })
+
+  test("applies only suffix when prefix is not provided", async () => {
+    const {config, core} = await loadConfig()
+    vi.mocked(core.getInput).mockImplementation(name => {
+      if (name === "message") return "hello there"
+      if (name === "suffix") return "```"
+      return ""
+    })
+    expect(await config.getBody()).toBe("hello there\n```")
+  })
 })