Merge pull request #613 from EESSI/EESSI-happy-hour-012

Add Happy-hour-012 slides+recording

Author: boegel

docs/training-events/2025/EESSI-happyhour-2025-012-Contributing-software-to-EESSI.pdf

@@ -6,6 +6,13 @@ Find slides, and video recordings of earlier sessions below.
 
 # Topic series: Building on top of EESSI
 
+### Monday 03 November 2025
+
+**Outline:** Contributing software packages to EESSI
+([Slides (PDF)](EESSI-happyhour-2025-012-Contributing-software-to-EESSI.pdf), [Recording (YouTube)](https://))
+
+<iframe width="560" height="315" src="https://www.youtube.com/embed/BYgQlI5mmzs?si=HrQMZa0ckcR_EkQF" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" referrerpolicy="strict-origin-when-cross-origin" allowfullscreen></iframe>
+
 ### Monday 27 October 2025
 
 **Outline:** Building on top of EESSI using `buildenv` modules

docs/training-events/2025/happy-hours-previous-sessions.md

@@ -31,16 +31,16 @@ If you haven't joined the EESSI Slack yet, [click here to join](https://join.sla
 
 ---
 
-### 💡 **Next Session**: Contributing software packages to EESSI
-### Topic Series: Building on top of EESSI
+### 💡 **Next Session**: Debugging EESSI software builds
+### Topic Series: Troubleshooting and Debugging EESSI software builds
 🗓️ Schedule
-#### Monday 03 November 2025, 14:00-15:00 CE(S)T
+#### Monday 10 November 2025, 14:00-15:00 CE(S)T
 
 ---
 
-### Upcoming sessions in the topic series: Building on top of EESSI
+### Upcoming sessions in the topic series: Troubleshooting and Debugging EESSI software builds
 ###### Outline
-- 03 November 2025 - Contributing software packages to EESSI
+- 10 November 2025 - Debugging EESSI software builds
 
 ---
 
@@ -52,6 +52,9 @@ See the full Recordings, slides, and materials here: [Previous Sessions & Videos
 
 *Topic series: Building on top of EESSI*
 
+
+- 03 November 2025 [Contributing software packages to EESSI](https://www.youtube.com/watch?v=BYgQlI5mmzs)
+
 - 27 October 2025 [Building on top of EESSI using `buildenv` modules](https://youtu.be/0uwUlM1xqNk)
 
 - 20 October 2025 [How we build software in EESSI](https://www.youtube.com/watch?v=KkD6vtPqqMs)