Extract bump-changelog action into separate workflow

.github/workflows/bump-changelog.yml

@@ -0,0 +1,51 @@
+name: Bump changelog before release
+
+on:
+  workflow_dispatch:
+    inputs:
+      version:
+        description: 'Version to be released'
+        required: true
+        type: string
+
+env:
+  default-python: "3.12"
+  minimum-supported-python: "3.8"
+
+jobs:
+  bump-changelog:
+    name: Bump changelog
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+      pull-requests: write
+    steps:
+      - name: Checkout ${{ github.ref }}
+        uses: actions/checkout@v4
+      - name: Set up Python ${{ env.default-python }}
+        uses: actions/setup-python@v5
+        with:
+          python-version: ${{ env.default-python }}
+          cache: "pip"
+      - name: Get release version and construct PR branch
+        run: |
+          echo "RELEASE_VERSION=${{ inputs.version }}" >> $GITHUB_ENV
+          echo "PR_BRANCH=bump-changelog-for-${{ inputs.version }}" >> $GITHUB_ENV
+      - name: Create pull request branch
+        run: git switch -c $PR_BRANCH
+      - name: Install nox
+        run: python -m pip install nox
+      - name: Update changelog
+        run: nox --error-on-missing-interpreters --non-interactive --session build_changelog -- $RELEASE_VERSION
+      - name: Commit and push change
+        run: |
+          git config --global user.name 'github-actions[bot]'
+          git config --global user.email '41898282+github-actions[bot]@users.noreply.github.com'
+          git commit -am "Bump changelog for $RELEASE_VERSION"
+          git push origin $PR_BRANCH
+      - name: Create pull request
+        run: |
+          git fetch origin
+          gh pr create --base main --fill
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/tests.yml

@@ -122,40 +122,3 @@ jobs:
         uses: softprops/action-gh-release@v1
         with:
           files: pipx.pyz
-
-  bump-changelog:
-    name: Bump changelog on release
-    if: github.event_name == 'push' && startsWith(github.ref, 'refs/tags')
-    needs: [pypi-publish, upload-zipapp]
-    runs-on: ubuntu-latest
-    permissions:
-      contents: write
-      pull-requests: write
-    steps:
-      - name: Checkout ${{ github.ref }}
-        uses: actions/checkout@v4
-      - name: Set up Python ${{ env.default-python }}
-        uses: actions/setup-python@v5
-        with:
-          python-version: ${{ env.default-python }}
-          cache: "pip"
-      - name: Extract release tag
-        run: echo "RELEASE_VERSION=${GITHUB_REF#refs/*/}" >> $GITHUB_ENV
-      - name: Create pull request branch
-        run: git switch -c "bump-changelog-for-${RELEASE_VERSION}"
-      - name: Install nox
-        run: python -m pip install nox
-      - name: Update changelog
-        run: nox --error-on-missing-interpreters --non-interactive --session build_changelog -- $RELEASE_VERSION
-      - name: Commit and push change
-        run: |
-          git config --global user.name 'github-actions[bot]'
-          git config --global user.email '41898282+github-actions[bot]@users.noreply.github.com'
-          git commit -am "Bump changelog for $RELEASE_VERSION"
-          git push origin "bump-changelog-for-${RELEASE_VERSION}"
-      - name: Create pull request
-        run: |
-          git fetch origin
-          gh pr create --base main --fill
-        env:
-          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}

CONTRIBUTING.md

@@ -220,7 +220,8 @@ nox -s watch_docs
 
 ## Releasing New `pipx` Versions
 
-To publish to PyPI simply create a "published" release on GitHub. This will trigger GitHub workflows that publishes:
+To release a new version, manually run the `bump-changelog` action under the *"Actions"* tab, passing it the version to
+be released. Then, simply create a "published" release on GitHub. This will trigger GitHub workflows that publish:
 
 - the pipx version to PyPI,
 - the documentation to readthedocs,