add release workflow

.github/workflows/release.py

@@ -0,0 +1,61 @@
+#!/usr/bin/env python3
+import os
+import re
+import subprocess
+import shlex
+
+MAIN_FILE = 'main.go'
+VERSION_LINE = re.compile('version = "([0-9]+.[0-9]+.[0-9]+)"')
+
+
+def sh(cmd: str, env: dict | None = None) -> str:
+    cmd_parsed = shlex.split(cmd)
+    output = subprocess.run(cmd_parsed, check=True, text=True, capture_output=True, env=env)
+    return output.stdout.strip()
+
+
+def get_current_version() -> str:
+    with open(MAIN_FILE) as fd:
+        for line in fd:
+            if m := VERSION_LINE.match(line.strip()):
+                version = m.group(1)
+                return version if version.startswith('v') else 'v' + version
+
+    raise Exception('Unable to determine version')
+
+
+def tag(new_tag: str):
+    sh(f'git tag {new_tag}')
+    sh('git push --tags')
+
+
+def create_release(version: str):
+    sh(f'gh release create -n "Release {version}" -t "{version}" "version"')
+
+
+def release(version: str):
+    repo_name = os.environ['GITHUB_REPOSITORY'].split('/')[-1]
+    platform = sh('uname')
+    architecture = sh('uname -m')
+    asset_name = f'{repo_name}-{version}-{platform}-{architecture}'.lower()
+    sh(f'go build -o {asset_name}', env={'CGO_ENABLED': '0'})
+    sh(f'gh release upload "{version}" "{asset_name}"')
+
+
+def tag_and_release():
+    version = get_current_version()
+    versions = set(sh('git tag').split('\n'))
+    if version in versions:
+        return
+
+    tag(version)
+    create_release(version)
+    release(version)
+
+
+def main():
+    tag_and_release()
+
+
+if __name__ == '__main__':
+    main()

.github/workflows/release.yml

@@ -0,0 +1,19 @@
+name: Release new version
+
+on:
+  push:
+    branches:
+      - main
+  workflow_dispatch:
+    inputs:
+
+jobs:
+  release:
+    name: Release new version if no tag exists for it
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Create new tag and release
+        run: |
+          python3 .github/workflows/release.py