Merge pull request #338 from ESUG/conditionalJobGHA

Try to conditionally run agenda build

.github/workflows/makefile.yml

@@ -32,14 +32,22 @@ jobs:
           !path/**/*.pillar
         retention-days: 5
 
-  agenda_build:      
+  agenda_build: 
     uses: pillar-markup/Microdown-Agenda/.github/workflows/main.yml@main
-    with:
+     with:
       agenda_filename: 2024-Conference/agenda-workshop.md;2024-Conference/agenda.md;2023-Conference/agenda.md;2023-Conference/agenda-workshop.md;2022-Conference/agenda.md;2022-Conference/agenda-workshop.md
-
+
+  check_and_build:
+    uses: yumemi-inc/changed-files@v3
+    id: changed
+      with:
+      patterns: '*agenda*.md'
+      if: steps.changed.outputs.exists == 'true' 
+      run: agenda_build
+
   deploy:
     runs-on: ubuntu-latest
-    needs: [ecstatic_build, agenda_build]
+    needs: [ecstatic_build, check_and_build]
 
     steps:
     # needed by JamesIves/github-pages-deploy-action