fixed github action ubuntu version

tools/github/README.md

@@ -2,3 +2,5 @@
 
 The workflow `build-and-send.yaml` allows the user to build the diploma thesis via a github workflow.
 Adapt it to meet your needs.
+
+Note that sending the thesis, and therefore automated emails, using a school email address is not supported. It is best to use an email address that does not correspond to your school email address.

tools/github/build-and-send.yaml

@@ -6,10 +6,11 @@ on:
       - main
     paths:
       - Diplomarbeit/**
+  workflow_dispatch:
 
 jobs:
   build:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
 
     steps:
       - name: Checkout code
@@ -19,7 +20,7 @@ jobs:
       - name: Install dependencies
         run: |
           sudo apt-get update
-          sudo apt-get install git build-essential make-guile texlive-full pandoc pandoc-citeproc tree rsync hunspell hunspell-de-at
+          sudo apt-get install -y git build-essential make-guile texlive-full pandoc pandoc-citeproc tree rsync hunspell hunspell-de-at
 
           
       - name: Build DA-Thesis
@@ -27,7 +28,7 @@ jobs:
           make pdf -C HTLLE-DA-Vorlage SOURCEDIR=../Diplomarbeit/
 
 
-      - name:  Send File via Email
+      - name: Send File via Email
         uses: dawidd6/action-send-mail@v2
         with:
           server_address: smtp.gmail.com