ci: use release-please (#280)

* add a release-please action, that allows manually creating new releases by merging a PR
* rename VERSION into version.txt
* add an action that checks PRs' title to ensure that it uses the conventional commit format
* remove old CHANGELOG.md

.github/workflows/pr_lint.yml

@@ -0,0 +1,16 @@
+name: Check PR title
+on:
+  pull_request_target:
+    types:
+      - opened
+      - reopened
+      - edited
+      - synchronize
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: aslafy-z/conventional-pr-title-action@v3
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/release-please.yml

@@ -0,0 +1,20 @@
+on:
+  push:
+    branches:
+      - develop
+  workflow_dispatch:
+
+permissions:
+  contents: write
+  pull-requests: write
+
+name: release-please
+
+jobs:
+  release-please:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: googleapis/release-please-action@v3
+        with:
+          token: ${{ secrets.EQASIM_PAT }}
+          release-type: simple

documentation/meta_output.py

@@ -11,7 +11,7 @@ def configure(context):
 
 def get_version():
     version_path = os.path.dirname(os.path.realpath(__file__))
-    version_path = os.path.realpath("{}/../VERSION".format(version_path))
+    version_path = os.path.realpath("{}/../version.txt".format(version_path))
 
     with open(version_path) as f:
         return f.read().strip()

version.txt

@@ -0,0 +1 @@
+1.2.0