release: don't require manual edits to version.bzl

Instead the release process should key off the git tag

Author: alexeagle

.github/workflows/release.yml

@@ -20,9 +20,17 @@ jobs:
           # Bazelisk will download bazel to here
           XDG_CACHE_HOME: ~/.cache/bazel-repo
         run: bazel --bazelrc=.github/workflows/ci.bazelrc --bazelrc=.bazelrc test //...
+      - name: Rename release artifact with version
+        run: cp $(ls bazel-out/*/bin/*.tar.gz | tail -1) "bazel_lib-$(git describe --tags | sed 's/^v//').tar.gz"
+      # TODO: move this into bazel to produce the file with expand_template rule when it has stamping
+      - name: Prepare workspace snippet
+        run: |
+          echo -e "WORKSPACE snippet:\n\n\`\`\`starlark\nhttp_archive(\n    name = \"aspect_bazel_lib\"," > release_notes.txt
+          echo "    sha256 = \"$(shasum -a 256 *.tar.gz | awk '{print $1}')\"," >> release_notes.txt
+          echo -e "    url = \"https://github.com/aspect-build/bazel-lib/releases/download/$(git describe --tags)/$(ls *.tar.gz)\",\n)\n\`\`\`" >> release_notes.txt
       - name: Release
         uses: softprops/action-gh-release@v1
         with:
           prerelease: true
-          files: |
-            bazel-out/*/bin/*.tar.gz
+          body_path: release_notes.txt
+          files: "*.tar.gz"

BUILD.bazel

@@ -1,6 +1,5 @@
 load("@bazel_skylib//:bzl_library.bzl", "bzl_library")
 load("@rules_pkg//:pkg.bzl", "pkg_tar")
-load(":version.bzl", "VERSION")
 load("@bazel_gazelle//:def.bzl", "gazelle", "gazelle_binary")
 
 gazelle_binary(
@@ -15,7 +14,7 @@ gazelle(
 
 # This declares the release artifact users
 pkg_tar(
-    name = "bazel_lib-" + VERSION,
+    name = "bazel_lib",
     srcs = [
         "README.md",
         "version.bzl",
@@ -38,9 +37,3 @@ bzl_library(
         "@bazel_tools//tools/build_defs/repo:utils.bzl",
     ],
 )
-
-bzl_library(
-    name = "version",
-    srcs = ["version.bzl"],
-    visibility = ["//visibility:public"],
-)