Add enhanced Bluesky posting workflow with contextual messaging and robust error handling

.github/scripts/README.md

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+# Bluesky Posting Workflow
+
+This directory contains the GitHub Actions workflow and script for automatically posting Utah Data Science Center events to Bluesky.
+
+## How it works
+
+1. **Schedule**: The workflow runs twice a week:
+   - Mondays at 9:00 AM MST
+   - Wednesdays at 8:00 AM MST
+
+2. **Data Source**: The script fetches the next upcoming event from the Utah Data Science Center Google Calendar (calendar ID: `ekol7ulqm14nv155angut2rlfo@group.calendar.google.com`)
+
+3. **Posting**: It formats the event information into a social media-friendly message and posts it to Bluesky using the AT Protocol
+
+## Setup Instructions
+
+### Required GitHub Secrets
+
+To enable Bluesky posting, add the following secrets to your GitHub repository:
+
+1. Go to your repository Settings → Secrets and variables → Actions
+2. Add these repository secrets:
+   - `BLUESKY_USERNAME`: Your Bluesky handle (e.g., `username.bsky.social`)
+   - `BLUESKY_PASSWORD`: Your Bluesky app password (not your regular password!)
+
+### Creating a Bluesky App Password
+
+1. Log in to Bluesky
+2. Go to Settings → App Passwords
+3. Create a new app password for "GitHub Actions Bot" 
+4. Use this app password (not your regular password) as `BLUESKY_PASSWORD`
+
+### Optional Secrets
+
+- `GOOGLE_CALENDAR_API_KEY`: If you want to use a different Google Calendar API key (the script has a fallback to the existing key)
+
+## Manual Testing
+
+You can manually trigger the workflow by:
+1. Going to the Actions tab in your repository
+2. Selecting "Post to Bluesky"
+3. Clicking "Run workflow"
+
+## Files
+
+- `bluesky-post.yml`: GitHub Actions workflow definition
+- `post_to_bluesky.py`: Python script that handles calendar fetching and Bluesky posting
+- `README.md`: This documentation file
+
+## Message Format
+
+The bot posts messages in this format:
+
+```
+🔬 Join us for our next Utah Data Science Center event!
+📅 [Event Title]
+⏰ [Day, Month Date at Time]
+📍 [Location]
+
+[Brief description...]
+
+🔗 More info: https://datascience.utah.edu/seminar
+📅 Calendar: [Google Calendar Link]
+
+#DataScience #Utah #AI #MachineLearning
+```
+
+If no upcoming events are found, it posts a generic message directing people to the website.