comment about testing version

Author: alexeagle

bazel/private/prebuilt_tool_integrity.bzl

@@ -3,25 +3,16 @@
 This file contents are entirely replaced during release publishing, by .github/workflows/release_prep.sh
 so that the integrity of the prebuilt tools is included in the release artifact.
 
-The checked in content is only here to allow load() statements in the sources to resolve.
+The checked in content is only here to allow load() statements in the sources to resolve, and permit local testing.
 """
 
-RELEASE_VERSION = "v33.0"
+# An arbitrary version of protobuf that includes pre-built binaries.
+# See /examples/example_without_cc_toolchain which uses this for testing.
+_TEST_VERSION = "v33.0"
+_TEST_SHAS = dict()
+# Add a couple platforms which are commonly used for testing.
+_TEST_SHAS["protoc-33.0-linux-x86_64.zip"] = "d99c011b799e9e412064244f0be417e5d76c9b6ace13a2ac735330fa7d57ad8f"
+_TEST_SHAS["protoc-33.0-osx-aarch_64.zip"] = "3cf55dd47118bd2efda9cd26b74f8bbbfcf5beb1bf606bc56ad4c001b543f6d3"
 
-# Fetched from the last release of protobuf, so the example can work
-RELEASED_BINARY_INTEGRITY = {
-  "MODULE.bazel.intoto.jsonl": "32ee438bf7e3a210a6b7d5e2d272900a2e7f4a1b4f0992fdf0490281771cac3e",
-  "protobuf-33.0.tar.gz": "7a796fd9a7947d51e098ebb065d8f8b45ea0ac313ac89cc083456b3005329a1a",
-  "protobuf-33.0.zip": "aaddf29b205ed915100a5fd096e8252842b67da9accfb7ba91ec3680ea307e45",
-  "protoc-33.0-linux-aarch_64.zip": "4b96bc91f8b54d829b8c3ca2207ff1ceb774843321e4fa5a68502faece584272",
-  "protoc-33.0-linux-ppcle_64.zip": "4eb7682900d01e4848fe9b30b9beeffaf9ed2a8d7e8d310c50ed521dbb33411c",
-  "protoc-33.0-linux-s390_64.zip": "96ee21d761e93bbfa7095ed14e769446c8d9790fecfbd7d6962e858350e0da95",
-  "protoc-33.0-linux-x86_32.zip": "49edaf078e48d4f45b17be31076ac7dbf64474cd7f1ee3b2cac0938bf0f778f3",
-  "protoc-33.0-linux-x86_64.zip": "d99c011b799e9e412064244f0be417e5d76c9b6ace13a2ac735330fa7d57ad8f",
-  "protoc-33.0-osx-aarch_64.zip": "3cf55dd47118bd2efda9cd26b74f8bbbfcf5beb1bf606bc56ad4c001b543f6d3",
-  "protoc-33.0-osx-universal_binary.zip": "88c0a52f048827d6892cd3403e3ae4181208ab261f93428c86d1736f536a60ec",
-  "protoc-33.0-osx-x86_64.zip": "e4e50a703147a92d1a5a2d3a34c9e41717f67ade67d4be72b9a466eb8f22fe87",
-  "protoc-33.0-win32.zip": "3941cc8aeb0e8f59f2143b65f594088f726bb857550dabae5d0dee3bf1392dd1",
-  "protoc-33.0-win64.zip": "3742cd49c8b6bd78b6760540367eb0ff62fa70a1032e15dafe131bfaf296986a",
-  "source.json.intoto.jsonl": "139f2eabd41a050cfde345589fb565cad4fb4f2d86dc084ad9bca3cf0806b5d6"
-}
+RELEASE_VERSION = _TEST_VERSION
+RELEASED_BINARY_INTEGRITY = _TEST_SHAS