ci: mastodonbot (#197)

attempt to fix run logic - last time the post action did not run on
creating the release

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

- **Workflow Updates**
  - Enhanced GitHub Actions workflow for Mastodon posting.
- Broadened conditions to trigger posting for pull requests with titles
containing 'release', 'v', or 'version'.
  - Improved error message clarity in the posting script.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Author: cmeesters

.github/workflows/post_to_mastodon.sh

@@ -2,7 +2,7 @@
 
 # Extract version from PR tag passed as environment variable
 if [ -z "${PR_TITLE}" ]; then # apparently unset, workflow broken?
-    echo "Error: 'PR_TITLE' environemnt variable is not set."
+    echo "Error: 'PR_TITLE' environment variable is not set."
     exit 1
 fi
 version="${PR_TITLE##* }"

.github/workflows/post_to_mastodon.yml

@@ -14,7 +14,7 @@ jobs:
   post_to_mastodon:
     if: |
       github.event.pull_request.merged == true &&
-      (startsWith(github.event.pull_request.title, 'release') || contains(github.event.pull_request.title, ' v'))    
+      (contains(github.event.pull_request.title, 'release') || contains(github.event.pull_request.title, ' v') || contains(github.event.pull_request.title, 'version'))
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4