chore: add workflow to create a release

.github/workflows/version_bump.yml

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+name: version_bump
+
+jobs:
+  build:
+    name: version bump
+    runs-on: ubuntu-22.04
+    timeout-minutes: 30
+
+    env:
+      CARGO_TERM_COLOR: always
+      RUST_BACKTRACE: full
+      RUSTC_FORCE_INCREMENTAL: 1
+
+    steps:
+      - name: Configure git
+        run: |
+          git config --global core.symlinks true
+          git config --global fetch.parallel 32
+
+      - name: Clone repository
+        uses: actions/checkout@v3
+        with:
+          token: ${{ secrets.DENOBOT_PAT }}
+          submodules: recursive
+
+      - uses: denoland/setup-deno@v1
+      - uses: dsherret/rust-toolchain-file@v1
+
+      - name: Create PR for release
+        env:
+          GITHUB_TOKEN: ${{ secrets.DENOBOT_PAT }}
+          GH_WORKFLOW_ACTOR: ${{ github.actor }}
+        run: |
+          git remote add upstream https://github.com/denoland/deno
+          git config user.email "${{ github.actor }}@users.noreply.github.com"
+          git config user.name "${{ github.actor }}"
+          ./tools/create_pr_for_release.ts

tools/create_pr_for_release.ts

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+#!/usr/bin/env -S deno run -A --lock=tools/deno.lock.json
+// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
+import { DenoWorkspace } from "./deno_core_workspace.ts";
+import { $, createOctoKit, getGitHubRepository } from "./deps.ts";
+
+const octoKit = createOctoKit();
+const workspace = await DenoWorkspace.load();
+const repo = workspace.repo;
+const denoCoreCrate = workspace.getDenoCoreCrate();
+
+// increment the core version
+await denoCoreCrate.increment("minor");
+
+// increment the dependency crate versions
+for (const crate of workspace.getDenoCoreDependencyCrates()) {
+  await crate.increment("minor");
+}
+
+// update the lock file
+await workspace.getDenoCoreCrate().cargoUpdate("--workspace");
+
+const originalBranch = await repo.gitCurrentBranch();
+const newBranchName = `release_${denoCoreCrate.version.replace(/\./, "_")}`;
+
+// Create and push branch
+$.logStep(`Creating branch ${newBranchName}...`);
+await repo.gitBranch(newBranchName);
+await repo.gitAdd();
+await repo.gitCommit(denoCoreCrate.version);
+$.logStep("Pushing branch...");
+await repo.gitPush("-u", "origin", "HEAD");
+
+// Open PR
+$.logStep("Opening PR...");
+const openedPr = await octoKit.request("POST /repos/{owner}/{repo}/pulls", {
+  ...getGitHubRepository(),
+  base: originalBranch,
+  head: newBranchName,
+  draft: false,
+  title: denoCoreCrate.version,
+  body: getPrBody(),
+});
+$.log(`Opened PR at ${openedPr.data.url}`);
+
+function getPrBody() {
+  let text = `Bumped versions for ${denoCoreCrate.version}\n\n` +
+    `Please ensure:\n` +
+    `- [ ] Crate versions are bumped correctly\n` +
+    `To make edits to this PR:\n` +
+    "```shell\n" +
+    `git fetch upstream ${newBranchName} && git checkout -b ${newBranchName} upstream/${newBranchName}\n` +
+    "```\n";
+
+  const actor = Deno.env.get("GH_WORKFLOW_ACTOR");
+  if (actor != null) {
+    text += `\ncc @${actor}`;
+  }
+
+  return text;
+}

tools/deno_core_workspace.ts

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+// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
+
+import { $, Repo } from "./deps.ts";
+
+export class DenoWorkspace {
+  #repo: Repo;
+
+  static get rootDirPath() {
+    const currentDirPath = $.path.dirname($.path.fromFileUrl(import.meta.url));
+    return $.path.resolve(currentDirPath, "../");
+  }
+
+  static async load(): Promise<DenoWorkspace> {
+    return new DenoWorkspace(
+      await Repo.load({
+        name: "deno_core",
+        path: DenoWorkspace.rootDirPath,
+      }),
+    );
+  }
+
+  private constructor(repo: Repo) {
+    this.#repo = repo;
+  }
+
+  get repo() {
+    return this.#repo;
+  }
+
+  get crates() {
+    return this.#repo.crates;
+  }
+
+  /** Gets the deno_core dependency crates that should be published. */
+  getDenoCoreDependencyCrates() {
+    return this.getDenoCoreCrate()
+      .descendantDependenciesInRepo();
+  }
+
+  getDenoCoreCrate() {
+    return this.getCrate("deno_core");
+  }
+
+  getCrate(name: string) {
+    return this.#repo.getCrate(name);
+  }
+}

tools/deps.ts

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+// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
+
+export * from "https://raw.githubusercontent.com/denoland/automation/0.19.0/mod.ts";
+export * from "https://raw.githubusercontent.com/denoland/automation/0.19.0/github_actions.ts";