ci: setup release-please (#186)

Setup release-please to automate creating new tags according to semver
rules.

Author: apricote

.github/workflows/release-please.yml

@@ -0,0 +1,21 @@
+on:
+  push:
+    branches:
+      - main
+name: release-please
+
+jobs:
+  release-please:
+    # The secret HCLOUD_BOT_TOKEN is only available on the main repo, not in forks.
+    if: github.repository == 'hetznercloud/hcloud-python'
+
+    runs-on: ubuntu-latest
+    steps:
+      - uses: google-github-actions/release-please-action@v3
+        with:
+          token: ${{ secrets.HCLOUD_BOT_TOKEN }}
+          release-type: python
+          package-name: hcloud
+
+          extra-files: |
+            hcloud/__version__.py

hcloud/__version__.py

@@ -1 +1 @@
-VERSION = "1.19.0"
+VERSION = "1.19.0"  # x-release-please-version