chore(ci): only publish to PyPI if a new release was created (#38)

The semantic release GitHub Action will skip creating a new GitHub
release if there are no new releasable changes. This is expected, but
the release workflow assumed that there was always a new release to
publish to PyPI.

This PR updates the release workflow to move the PyPI publish steps to a
separate job that will only run if the release job successfully creates
a new release.

.github/workflows/release.yaml

@@ -1,6 +1,5 @@
 name: Generate Next Release
 # This workflow will generate changelog and release notes.
-# Source: https://github.com/terraform-aws-modules/terraform-aws-vpc/blob/master/.github/workflows/release.yml
 
 on:
   workflow_dispatch:
@@ -9,10 +8,11 @@ env:
   DIST_DIR: dist
 jobs:
   release:
-    name: Build and publish package
+    name: Create next release
     runs-on: ubuntu-latest
-    permissions:
-      id-token: write 
+
+    outputs:
+      new_release_published: ${{ steps.release.outputs.new_release_published }}
 
     steps:
       - name: Checkout
@@ -21,23 +21,14 @@ jobs:
           fetch-depth: 0
           ssh-key: ${{ secrets.DEPLOY_KEY }}
 
-      - name: Install Python
-        uses: actions/setup-python@v5
-        with:
-          python-version-file: .python-version
-
-      - name: Install dependencies
-        run: |
-          python -m pip install --upgrade build
-
       - name: Create GitHub release
+        id: release
         uses: cycjimmy/semantic-release-action@v4
         with:
-          semantic_version: 19.0.5
           extra_plugins: |
             @semantic-release/[email protected]
             @semantic-release/[email protected]
-            conventional-changelog-conventionalcommits@4.6.3
+            conventional-changelog-conventionalcommits@8.0.0
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           GIT_AUTHOR_NAME: equinix-labs@auto-commit-workflow
@@ -46,11 +37,36 @@ jobs:
           GIT_COMMITTER_EMAIL: [email protected]
           RELEASE_REQUESTER: "@${{ github.event.sender.login }}"
 
+  publish:
+    name: Publish artifacts
+    runs-on: ubuntu-latest
+    needs: release
+    if: needs.release.outputs.new_release_published == 'true'
+
+    permissions:
+      id-token: write
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+          ssh-key: ${{ secrets.DEPLOY_KEY }}
+
+      - name: Install Python
+        uses: actions/setup-python@v5
+        with:
+          python-version-file: .python-version
+
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade build
+
       - name: Build package
         run: |
           python -m build --sdist --wheel --outdir ${{ env.DIST_DIR }} .
 
-      - name: Publish package
+      - name: Publish to PyPI
         uses: pypa/gh-action-pypi-publish@release/v1
         with:
           packages-dir: ${{ env.DIST_DIR }}