Create CI script to trigger a release on new version in Cargo.toml

.github/workflows/trigger-release.yml

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+name: Build
+
+on:
+  push:
+    branches:
+      - "main"
+
+jobs:
+  check:
+    name: Trigger Release
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: "Install Python Libraries"
+        run: python -m pip install --user -r .github/workflows/trigger-release/requirements.txt
+
+      - name: "Run release script"
+        run: "python3 .github/workflows/trigger-release/trigger-release.py"
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/trigger-release/requirements.txt

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+toml

.github/workflows/trigger-release/trigger-release.py

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+import toml
+import requests
+import subprocess
+
+cargo_toml = toml.load("Cargo.toml")
+crate_version = cargo_toml["workspace"]["package"]["version"]
+print("Detected crate version " + crate_version)
+
+api_url = "https://crates.io/api/v1/crates/bootloader/" + crate_version
+released_version = requests.get(api_url).json()
+
+if "version" in released_version:
+    version = released_version["version"]
+    assert (version["crate"] == "bootloader")
+    assert (version["num"] == crate_version)
+    print("Version " + crate_version + " already exists on crates.io")
+
+else:
+    print("Could not find version " + crate_version +
+          " on crates.io; creating a new release")
+
+    tag_name = "v" + crate_version
+    print("  Tagging commit as " + tag_name)
+    sha = subprocess.run(["git", "rev-parse", "HEAD"], check=True,
+                         stdout=subprocess.PIPE).stdout.decode("utf-8").strip()
+    subprocess.run([
+        "gh", "api", "/repos/rust-osdev/x86_64/git/refs",
+        "-X", "POST", "-H", "Accept: application/vnd.github.v3+json",
+        "-F", "ref=refs/tags/" + tag_name,
+        "-F", "sha="+sha
+    ])
+
+    subprocess.run([
+        "gh", "api", "--method", "POST", "-H", "Accept: application/vnd.github+json",
+        "/repos/rust-osdev/bootloader/releases",
+        "-f", f"tag_name='{tag_name}'", "-f", f"target_commitish='{sha}'",
+        "-f", f"name='{tag_name}'",
+        "-f", "body='[Changelog](https://github.com/rust-osdev/bootloader/blob/main/Changelog.md)'",
+        "-F", "draft=false", "-F", "prerelease=false", "-F", "generate_release_notes=false",
+    ])
+
+    print("  Done")