ci: finalize manual podman build pipeline for fluffy-pancake

.gitea/workflows/build.yml

@@ -2,8 +2,8 @@ name: Build container image
 
 on:
   schedule:
-    - cron: '05 12 * * 2,5'   # Baut automatisch Dienstags und Freitags um 12:05 Uhr
-  workflow_dispatch:         # Schaltet den "Run Workflow"-Button im Gitea-Dashboard frei
+    - cron: '05 12 * * 2,5'
+  workflow_dispatch:
 
 env:
   IMAGE_DESC: "Custom Fedora bootc image"
@@ -18,10 +18,7 @@ concurrency:
 jobs:
   build_push:
     name: Build and push image
-    runs-on: ubuntu-24.04
-    container:
-      image: quay.io/podman/stable:latest
-      options: --privileged
+    runs-on: ubuntu-24.04  # Läuft jetzt auf Ubuntu (bringt Node.js für Actions nativ mit!)
 
     permissions:
       contents: read
@@ -29,9 +26,14 @@ jobs:
       id-token: write
 
     steps:
-      - name: Install CI Prerequisites
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      # Wir installieren Podman und jq direkt im Ubuntu-Runner. Das dauert nur ~10 Sekunden.
+      - name: Install Podman & Tools
         run: |
-          dnf install -y curl jq
+          sudo apt-get update
+          sudo apt-get install -y podman jq curl
 
       - name: Prepare environment
         run: |
@@ -50,9 +52,6 @@ jobs:
             echo "IS_TEST_BUILD=true" >> ${GITHUB_ENV}
           fi
 
-      - name: Checkout
-        uses: actions/checkout@v4
-
       - name: Image Metadata
         uses: docker/metadata-action@v5
         id: metadata