Improve PR body text

Make the workflow text optional if there is a rlease workfow defined

.github/workflows/release.yaml

@@ -25,4 +25,6 @@ jobs:
       with:
         github-token: ${{ secrets.GITHUB_TOKEN }}
         release-workflow: ''
+        version-command: |
+          sed -r -i '' 's#(labd/changie-release-action@)([^[:space:]]+)#\1'"${PACKAGE_VERSION}"'#' README.md
 

README.md

@@ -1,10 +1,12 @@
 # changie-release-action
 Automate version and release management using [changie](https://github.com/miniscruff/changie)
 
-This action creates a new PR with an updated `CHANGELOG.md` file. When merged it will automatically
-create a new tag and trigger another GitHub action workflow that can then do the actual release.
+This action creates a new PR with an updated `CHANGELOG.md` file. When merged it
+will automatically create a new tag and trigger another GitHub action workflow
+that can then do the actual release.
 
-The workflow is inspired both by [changie](https://github.com/miniscruff/changie) and [@changesets/action](https://github.com/changesets/action)
+The workflow is inspired both by [changie](https://github.com/miniscruff/changie)
+and [@changesets/action](https://github.com/changesets/action)
 
 ## Usage
 
@@ -34,11 +36,15 @@ jobs:
       uses: labd/[email protected]
       with:
         github-token: ${{ secrets.GITHUB_TOKEN }}
-
+
+        # Optionally run a command with the new version number when the new
+        # version is determined.
+        version-command: 'echo "New version is $PACKAGE_VERSION" > version.txt'
+
         # Trigger another release workflow to do the actual release.
         # Set to for example `release.yaml` to trigger that workflow.
         # Default is no trigger
-        release-workflow: 'release.yaml' 
+        release-workflow: 'release.yaml'
 ```
 
 ## Triggering a release

action.yaml

@@ -98,7 +98,7 @@ runs:
         commit-message: Release ${{ steps.latest.outputs.output }}
         token: ${{ inputs.github-token }}
         body: |
-          This PR was created by the [Changie release GitHub action](https://github.com/labd/changie-release-action). When you're ready to do a release, you can merge this and the tag ${{ steps.latest.outputs.output}} will be created and the release workflow will be started.  If you're not ready to do a release yet, that's fine, whenever you add more changes to main, this PR will be updated.
+          This PR was created by the [Changie release GitHub action](https://github.com/labd/changie-release-action). When you're ready to do a release, you can merge this and the tag ${{ steps.latest.outputs.output }} will be created${{ inputs.release-workflow != '' && format(' and the {0} workflow will be started', inputs.release-workflow) || '' }}.  If you're not ready to do a release yet, that's fine, whenever you add more changes to main, this PR will be updated.
 
           # Releases
           ${{ steps.changelog.outputs.output }}