cd: create GH Actions workflow to prepare release on dispatch

.github/workflows/maven-version-determiner.py

@@ -0,0 +1,67 @@
+#!/usr/bin/python3
+import re
+import subprocess
+import sys
+
+
+def get_first_arg() -> str:
+    # First arg can/should be `MAJOR`, `MINOR` or `PATCH`
+    return sys.argv[1]
+
+
+def get_current_version() -> str:
+    current_version = subprocess.run(
+        "mvn help:evaluate -Dexpression=project.version -q -DforceStdout",
+        shell=True, capture_output=True, text=True)
+    return current_version.stdout
+
+
+def get_new_version(release_type: str, current_version: str) -> str:
+    major, minor, patch = dissect_version(current_version)
+
+    match release_type:
+        case "MAJOR":
+            major, minor, patch = get_major_release(major)
+        case "MINOR":
+            major, minor, patch = get_minor_release(major, minor)
+        case "PATCH":
+            major, minor, patch = get_patch_release(major, minor, patch)
+
+    return str(major) + "." + str(minor) + "." + str(patch)
+
+
+def dissect_version(current_version) -> (int, int, int):
+    version_regex = re.compile(
+        r'^(?P<major>[0-9]+)\.(?P<minor>[0-9+])\.(?P<patch>[0-9+])-SNAPSHOT')
+    regex_match = version_regex.search(current_version)
+    major: int = int(regex_match.groupdict().get("major"))
+    minor: int = int(regex_match.groupdict().get("minor"))
+    patch: int = int(regex_match.groupdict().get("patch"))
+    return major, minor, patch
+
+
+def get_major_release(major):
+    major += 1
+    minor = 0
+    patch = 0
+    return major, minor, patch
+
+
+def get_minor_release(major, minor):
+    minor += 1
+    patch = 0
+    return major, minor, patch
+
+
+def get_patch_release(major, minor, patch):
+    patch += 1
+    return major, minor, patch
+
+
+if __name__ == "__main__":
+    release_type = get_first_arg()
+
+    current_version = get_current_version()
+    new_version = get_new_version(release_type, current_version)
+
+    print(new_version)

.github/workflows/prepare-release.yml

@@ -0,0 +1,27 @@
+name: prepare-release
+
+on:
+  workflow_dispatch:
+    inputs:
+      release:
+        description: Type of release
+        required: true
+        type: choice
+        options:
+          - PATCH
+          - MINOR
+          - MAJOR
+        default: PATCH
+
+jobs:
+  prepare:
+    runs-on: ubuntu-latest
+    steps:
+      - run: >
+          pwd
+      - run: >
+          echo "The release type should be ${{ inputs.release }}"
+      - run: |
+          new_version=./.github/workflows/maven-version-determiner release_type
+          echo $new_version
+        env: ${{ inputs.release }}