GitHub Actions: Auto Docker-Build + Feature-Request.md

- GitHub Actions Workflow baut Docker-Image bei jedem Push
- Image wird zu ghcr.io/kroonk/photography gepusht
- Feature-Request.md mit Nutzerverwaltung/Login-System angelegt

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.github/workflows/docker-build.yml

@@ -0,0 +1,36 @@
+name: Build & Push Docker Image
+
+on:
+  push:
+    branches: [master]
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Log in to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          push: true
+          tags: |
+            ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:latest
+            ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ github.sha }}