CICD: Add GitHub Action File for Documentation Processing.

Also add an appropriate branch condition to the actions building
docker images.

Signed-off-by: Michael Keller <github@ike.ch>

.github/workflows/android-dockerimage.yml

@@ -2,6 +2,8 @@ name: Android Docker Image CI
 
 on:
   push:
+    branches:
+    - master
     paths:
     - scripts/docker/android-build-container/**
     - .github/workflows/android-dockerimage.yml

.github/workflows/documentation.yml

@@ -0,0 +1,33 @@
+name: Documentation
+
+on:
+  push:
+    branches:
+    - master
+    paths:
+    - Documentation
+    - .github/workflows/documentation.yml
+  pull_request:
+    branches:
+    - master
+    paths:
+    - Documentation
+    - .github/workflows/documentation.yml
+
+jobs:
+  documentation:
+    runs-on: ubuntu-22.04
+
+    steps:
+    - name: Install Packages
+      run: |
+        sudo apt-get -y update
+        sudo apt-get -y install asciidoc docbook-xml w3m
+
+    - name: Checkout Sources
+      uses: actions/checkout@v4
+
+    - name: Process the Documentation
+      id: process_documentation
+      working-directory: Documentation
+      run: make

.github/workflows/windows-mxe-dockerimage.yml

@@ -2,6 +2,8 @@ name: Windows (MXE) Docker Image
 
 on:
   push:
+    branches:
+    - master
     paths:
     - scripts/docker/mxe-build-container/**
     - .github/workflows/windows-mxe-dockerimage.yml