ci: add manual trigger to bump the versions accordingly

This GH Actions workflow uses the previously created script to bump the versions automatically. The workflow can be triggered manually as a `workflow_dispatch`, and you just have to give it the input of wanting to do a patch release, a minor release, or a major release. It then bumps to the appropriate release version, commits it and tags it. Afterwards, it automatically bumps the version to the next snapshot version.

As the new release version is tagged, a release can be created when checking out this tag.

.github/workflows/manual_release_trigger.yaml

@@ -0,0 +1,69 @@
+name: Prepare release manually
+
+on:
+  workflow_dispatch:
+    inputs:
+      release:
+        description: 'Type of release'
+        required: true
+        type: choice
+        options:
+          - 'MAJOR'
+          - 'MINOR'
+          - 'PATCH'
+        default: 'PATCH'
+
+jobs:
+  bump-versions:
+
+    name: Bump versions and tag
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+
+    steps:
+
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+          sparse-checkout: |
+            .github
+            ci
+            src
+            pyproject.toml
+            requirements.txt
+
+      - name: Determine new versions
+        run: |
+          echo "release_version=$(./ci/version_determiner.py release-version $release_type)" >> "$GITHUB_ENV"
+          echo "version_tag=$(./ci/version_determiner.py version-tag $release_type)" >> "$GITHUB_ENV"
+          echo "snapshot_version=$(./ci/version_determiner.py snapshot-version $release_type)" >> "$GITHUB_ENV"
+        env:
+          release_type: ${{ inputs.release }}
+
+      - name: Print new versions
+        run: |
+          echo "Release version: $release_version"
+          echo "Version tag: $version_tag"
+          echo "Snapshot version: $snapshot_version"
+
+      - name: Configure Git user
+        run: |
+          git config user.email "[email protected]"
+          git config user.name "GitHub Actions Bumper"
+
+      - name: Bump to release version and tag
+        run: |
+          ./ci/version_writer.py $release_version
+          git commit --all --message "Bump version to $release_version"
+          git tag --annotate --message "Release $version_tag" $version_tag
+
+      - name: Bump to snapshot version
+        run: |
+          ./ci/version_writer.py $snapshot_version
+          git commit --all --message "Bump version to $snapshot_version"
+
+      - name: Push version changes and tag
+        uses: ad-m/github-push-action@master
+        with:
+          tags: true