feat: Add playwright_integrity_map rule (#12)

Fixes #11

This PR adds a rule which can generate an integrity map for a matrix
of playwright browsers and platforms. This should help users who are
using different versions of playwright than what are contained with
KNOWN_BROWSER_INTEGRITY to more easily update their toolchain with
the right key value pairs.

Author: mrmeku

BUILD.bazel

@@ -1,5 +1,5 @@
 load("@bazel_skylib//rules:common_settings.bzl", "string_flag")
-load("//playwright:defs.bzl", "LINUX_DISTROS", "MACOS_VERSIONS")
+load("//playwright:defs.bzl", "LINUX_DISTROS", "MACOS_VERSIONS", "playwright_browser_matrix", "playwright_integrity_map")
 
 package(default_visibility = ["//visibility:public"])
 
@@ -14,3 +14,34 @@ string_flag(
     build_setting_default = "ubuntu24.04",
     values = LINUX_DISTROS,
 )
+
+playwright_integrity_map(
+    name = "playwright_integrity_map_1.49.1",
+    browsers = playwright_browser_matrix(
+        browser_names = [
+            "chromium-headless-shell",
+            "chromium",
+        ],
+        platforms = [
+            "mac14-arm64",
+            "ubuntu20.04-x64",
+        ],
+        playright_repo_name = "playwright-1.49.1",
+    ),
+)
+
+playwright_integrity_map(
+    name = "playwright_integrity_map_1.50.1",
+    browsers = playwright_browser_matrix(
+        browser_names = [
+            "chromium-headless-shell",
+            "chromium",
+        ],
+        platforms = [
+            "mac14-arm64",
+            "ubuntu20.04-x64",
+        ],
+        playright_repo_name = "playwright-1.50.1",
+    ),
+    silent = True,
+)