Add scheduled weekly build for upstream updates

.gitea/workflows/docker-test.yaml

@@ -5,6 +5,9 @@ on:
     branches-ignore:
       - main
       - default
+  schedule:
+    # Wöchentlich jeden Montag um 03:00 Uhr UTC (für Upstream-Updates)
+    - cron: '0 3 * * 1'
   workflow_dispatch:
 
 # ==============================================================================
@@ -16,6 +19,9 @@ env:
   REGISTRY_USER: "sandrodach"
   CUSTOM_IMAGE_NAME: "container/webhost"
 
+  # Welcher Branch soll beim automatischen Cron-Lauf (schedule) gebaut werden?
+  SCHEDULED_BRANCH: "8.5"
+
   # Pfad zum Build-Kontext und Dockerfile
   BUILD_CONTEXT: ./dockerfile
   DOCKERFILE: ./dockerfile/Dockerfile
@@ -44,17 +50,32 @@ env:
 
 jobs:
   build-test-push:
-    name: Build, Test & Push (${{ gitea.ref_name }})
+    name: Build, Test & Push (${{ gitea.event_name == 'schedule' && env.SCHEDULED_BRANCH || gitea.ref_name }})
     runs-on: ubuntu-latest
-    if: gitea.ref_name != 'main' && gitea.ref_name != 'default'
+    if: (gitea.ref_name != 'main' && gitea.ref_name != 'default') || gitea.event_name == 'schedule'
 
     steps:
       - name: Checkout Repository
         uses: actions/checkout@v4
 
+      - name: Switch to Target Branch on Schedule
+        if: gitea.event_name == 'schedule'
+        run: |
+          TARGET="${SCHEDULED_BRANCH:-8.5}"
+          echo "Schedule Trigger aktiv: Wechsle zu Branch '${TARGET}'..."
+          git fetch origin "${TARGET}"
+          git checkout "${TARGET}"
+
       - name: Prepare Image Tag from Branch
         id: meta
         run: |
+          if [ "${{ gitea.event_name }}" = "schedule" ]; then
+            RAW_BRANCH="${SCHEDULED_BRANCH:-8.5}"
+            echo "Schedule Event: Verwende Branch '${RAW_BRANCH}'"
+          else
+            RAW_BRANCH="${{ gitea.ref_name }}"
+          fi
+
           if [ -n "${CUSTOM_IMAGE_NAME}" ]; then
             IMAGE_REPO=$(echo "${CUSTOM_IMAGE_NAME}" | tr '[:upper:]' '[:lower:]')
           else
@@ -62,7 +83,7 @@ jobs:
           fi
 
           # Branch-Namen als Docker-Tag nutzen (Schrägstriche durch Bindestriche ersetzen)
-          BRANCH_TAG=$(echo "${{ gitea.ref_name }}" | sed 's/[^a-zA-Z0-9._-]/-/g')
+          BRANCH_TAG=$(echo "${RAW_BRANCH}" | sed 's/[^a-zA-Z0-9._-]/-/g')
           FULL_TAG="${REGISTRY}/${IMAGE_REPO}:${BRANCH_TAG}"
 
           echo "Target Image Tag: ${FULL_TAG}"
@@ -71,6 +92,8 @@ jobs:
       - name: Build Docker Image
         run: |
           docker build \
+            --pull \
+            --no-cache \
             -f "${DOCKERFILE}" \
             -t "${{ steps.meta.outputs.image_tag }}" \
             "${BUILD_CONTEXT}"